Hello SE friends,
Recently I read a book that involved the troubled relationship between the oldest daughter in the family and the youngest. It was fascinating and got me wondering about the role of birth order in our characters. I did some research and discovered there are volumes on the topic and plenty of anecdotal materials. So, over the next few posts, I will share some of that information with you.

When we craft our characters, many of us include comments about their placement in the family. We attach traits we’ve experienced with siblings or others close to us. I will explore some of those traits in my posts over the next several months.
Full disclosure, birth order theory is somewhat controversial because, in and of itself, it is not a determinant of someone’s personality. Many other factors include genetics, physical environment, gender, culture, family trauma, and much more. Still, birth order offers writers a tool for developing their characters. For that reason, in the next posts, I will focus on the traits of the (1) first-born, (2) the middle-born, (3) the last-born, and (4) the only child.
I leave you with a curious detail. Per the research, if there’s an age difference of three or more years between siblings, the birth order restarts. Given this tidbit, each of my four children is an “only” child. Between my eldest and my next child, there are seven years. Then there are five years between the next, and three and a half years between the final two. No wonder I had my hands full, right?
Just for fun, consider these three sets of accomplished men and women:
- Ernest Hemmingway and Princess Diana
- Ellen DeGeneres and Eddie Murphy
- Elon Musk and Eleanor Roosevelt
Which set do you imagine is first-born, middle-born, or last-born? I suspect you got them right. The answers are as follows: the two first-borns are Elon Musk and Eleanor Roosevelt. It’s a worthy exercise to think about why you chose them. The middle-borns are Ellen DeGeneres and Eddie Murphy. Did you guess them correctly? And of course, the last-borns are Ernest Hemmingway and Princess Diana.
If you are like me, you might be thinking about one or more of your characters. Where might he or she fit in birth order? And, why? We’ll discuss this and more over the next months. Till then, stay warm and have a wonderful day.

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I remember reading somewhere that the firstborn starts over when there is a five or more year gap OR if the next born child is of a different sex. Now I need to do more research! I’m wondering if this statistic has changed with the times. Are kids being sent off to pre-k earlier so that the next in line gets full attention? Food for thought. There are three years between each of us siblings. Actually 3.5 between me, the “they learned with me” first and the “poor, unfortunate” middle child and three years between her and the “she got everything” youngest sister.
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I studied this as part of my pscyh degree and found it fascinating. I like the idea of incorporating this aspect into developing your character(s), but we should all be wary of show-don’t-tell, as in describing someone with those assumptions: “she was the typical oldest sibling.” If the eldest is the one always trying to maintain peace and avoid conflict, sure, that’s an eldest trait (on average), but I still want to know where it comes from in that particular individual. So, great tool, but we need to be careful not to rely on it to fill in blanks we still need to fill in. Thanks for a thoughtful post, Gwen. I look forward to more!
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Excellent points, Stephen. Thank you. There are possibilities for character development in birth order theory, but we can’t forget to “show”. 😊
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Reblogged this on Stephen Geez Blog and commented:
Gwen M. Plano shares character-building ideas you’ve never thought about!
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Thank you for the reblog, Stephen. Much appreciated.
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Hi Gwen, I am a first born and I picked the correct first borns from your lists. First borns are usually the overachievers in families.
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So true, Robbie. I’m the eldest as well, which meant much was expected. There’s a reason we overachieve, and it wasn’t that we were naturally gifted. 😊
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Thanks for sharing this interesting perspective on the order of siblings Gwen xx
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Thank you, Debby. It’s a fascinating concept that is backed up by research. Hopefully, it will add to the writer’s tool chest of possibilities to consider. 😊
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🙂
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This is a very interesting topic. I really never thought about the big curves that could take into account the birth order for a story. Beautiful, Gwen! Thanks for sharing and a nice week that arrives. I forgot the new year 😉 Here are my honest wishes for a blessed and successful new year for you and your! xx Michael
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Thank you, Michael. I wish the same for you — a blessed and successful new year. 😊
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Reblogged this on https:/BOOKS.ESLARN-NET.DE.
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Thank you for the reblog. Very thoughtful of you. 😊
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Excellent topic, Gwen. It’s fascinating that the cycle restarts if there’s more than two years between siblings.
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Thank you, Sue. After three years, it restarts (according to researchers), but there will always be some of the order’s traits. Fascinating theory. I look forward to studying the research. 😊
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This is going to be an interesting series, Gwen. I’m looking forward to it.
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Thank you, Dan. I’m looking forward to studying the concept more and hopefully, providing some useful information to writers. 😊
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This topic was discussed many times in our family by my parents. I’m the youngest of four, and at least once a week, my mom would say to someone, “You know, we pay attention to make sure we don’t spoil our youngest.” They certainly didn’t do that, and I used to like to tease them about overcompensating.
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Your story made me chuckle, Pete. LOL. So sweet. My youngest son didn’t get a chance to be spoiled because my other sons tended to torment him. But truthfully, every mom has a special place in their heart for the youngest because he or she is the last baby. Thank you for sharing your story. Loved it! 😊
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This is a very interesting and timely post, Gwen. I have two current works in progress. One, set in 1910, has three sisters. The story is told through the eyes of the youngest (15). She’s wild, hard to control, and gets tangled up with a group of suffragettes. The middle girl (17) is overly cautious and only wants to get married and be a housewife and mother. The oldest (21) is married and has an infant son. She used to run wild and carried big dreams in her head–until her father sought to settle her down by marrying her off. Each of these girls have different personalities. The birth order comes into play–but according to the parents, not the girls themselves. This story is really the first time I’ve taken a serious look into the dynamics of birth order within a family. I look forward to your future posts, Gwen.
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Thank you, Beem. I look forward to reading your stories. Your brief description of the sisters sounds intriguing. All the best with both. 😊
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This lines up with what I’ve been working on, Gwen. My current WIP has three brothers and when I was developing their characters I based some of it on birth order. Great post!
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Thanks, Teri. Your WIP sounds like a must-read for me. More to come… 😊
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Great post, Gwen 🙂 I have used siblings in my stories, which is a stretch for me since I was an only child, with a temporary step brother. I do find it interesting with my own child and their birth order. They do have their own unique traits, but I like what you said they are only children to you. It is fun to read about it in stories and use that trait.
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Thank you, Denise. I think it’s fun as well, and I look forward to diving into the topic with the next post. 😊
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I’ve read general theories about birth order and there does seem to be a discernible pattern – although there’s plenty of siblings that break the rule! I’m the first-born and shared some of the responsibility for looking after my brothers. It’s a fascinating topic and I’m really looking forward to hearing more about it. xx
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Thank you, Trish. The concept of birth order and personality types is fascinating to me. As the firstborn, my experience was quite different from my six sibs. It’s always interesting (and fun) with the seven of us share stories. 😊
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That was unexpected and interesting, Gwen.
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I’m pleased you found it interesting, Jacqui. I’ll go into more depth with the next posts. 😊
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Ooh, this sounds fascinating, Gwen. I look forward to this series of posts. These types of studies and topics have always fascinated me. Though I am the youngest of four, going by the gap noted between ages, I would be an only child. I’m somewhat surprised that three year gap isn’t larger.
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Thank you, Mae. I hope the series is helpful or at least interesting to readers. I’m looking forward to doing more research on the topic. 😊
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Like D. Wallace Peach, I guessed Ellen and Eddie to be the youngest in birth order. The youngest in our neighborhood were the jokesters. The middle kids were the ones who felt they never got enough attention. Hemingway was so troubled, I placed him there. I was the oldest in our family, and my sister was born exactly ten months after me. My youngest sister wasn’t born until I was twelve, but she was definitely the “baby” of the family. And Patty–even before Mary was born–thought of herself as the neglected, middle child. That always amused me since she was the “baby” for eleven years.
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Family dynamics are amazing, aren’t they? Thank you, Judi, for sharing some of yours and adding to the mix of information about character development. As you’ve said, the youngest among my siblings is a bit of a jokester. I could say the same about the youngest of my kids. He always has people laughing. 😊
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Fantastic post, Gwen. Birth order played a role in one of my books. The hero was born last and much later than his older brothers. As a result, he believed his parents never wanted him…he was a mistake. This is going to be a great series! Enjoy the weekend. xo
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What a beautiful share, Jill. A miracle. I love that. Thank you. 😊
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Great post, Gwen. I was just talking about this yesterday with my dad. And I didn’t know that birth order starts over if there’s a larger gap in years. How interesting. I guessed wrong on the list. As a first-born, I guessed that one right. But I thought the last-borns were the funny wild-childs. That seemed true of my family. I always thought of the middle child as the lost child – stuck between the over-achieving first-born and pampered cutie last-born who knows how to get attention. I can’t wait for your series. Should be fascinating and fun. 😀
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Thank you, Diana. I’m the firstborn of a large family, so it’s no wonder I ended up in college administration, managing one student problem after another. I think my career surfaced when I was just one year old and helped my mom with my new baby sister and then the next five that followed. By the way, did you like dolls? I never played with them, because I had real babies to play with. 😊
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I did play with dolls, Gwen. But I liked to dress up my brothers too (to the mortification of my father). Lol. And I ended up in a career in management too!
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This looks to be an interesting series. (Most of my characters are only children or have only one sibling, so as not to overcomplicate the plot and clutter up the character landscape.)
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Thank you, Liz. My upcoming novel includes sibling exchanges between the first and middle sibs. But my prior books do not mention or assume the birth order of the characters. Writing a family-focused book lent itself to adding birth order traits. 😊
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You’re welcome, Gwen. I look forward to learning more about birth order. (I just know the usual generalities about it.)
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This is a fascinating topic, Gwen, and I look forward to the upcoming posts. Interesting about the birth order starting over. My husband is the youngest in his family. There are almost exactly 4.5 years between each sibling. However, the middle one definitely has middle child syndrome. My only sibling is twelve years older. He once remarked that in ways it was like we were both only children.
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Thank you for sharing, Joan. Your brother is very perceptive. It would be fascinating to hear why he said that. 😊
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It will be interesting to see where you take this. I had never thought of birth order and character development, but it sounds fascinating.
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Thanks, John. I’m looking forward to diving deep into the topic. We’ll see where it goes. 😊
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A most fascinating topic, Gwen. This information is going to give us writers tools for deepening our characters by adding this one aspect. I am the last born child in my family, and there are three years between my sister and me. My other siblings were much older, so it was like Mom had two different families. I look forward to the different psychological elements in birth order. Thank you for sharing!
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I agree with you, Jan. It’s a fascinating topic. I’m looking forward to delving into the research on this. It should be fun! 😊
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Interesting topic. Looking forward to more.
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Thank you, Craig. It’s an intriguing topic.
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A interesting thought. Although I know the birth order of most of my characters, I had never given it much thought in character development.
This is in spite of my mother’s comments. She was the third of five, and after my first was born said, “Don’t have an odd number of children. The middle one tends to be left out.”
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Your mom sounds very insightful, and from what you’ve mentioned, she spoke from experience. In some families, there are long-standing hurts from birth order differences. Over the years, my sibs and I have had many conversations about this topic and many discoveries. Thank you for sharing. 😊
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Yes, my mum was a wise person, with a terrific sense of humour.
I miss her lots, even after nearly 30 years.
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I find this topic fascinating. In our family we have identical twins and a sibling 4 years younger. Although only 7 minutes separated my twin from me, she being the younger, she definitely exhibits middle child syndrome. The brother I always saw as youngest, but in looking back and having read this post, I can see how he was more of an only child. I look forward to seeing more on this. Thanks for sharing, Gwen. Hugs 💕🙂
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I hadn’t thought about twins, Harmony. But my mom was a twin, and I think she saw her identical as younger, just as you’ve mentioned. This is fascinating! I’ll have to check into this more. 😊
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We often joke about birth order in my family, but I (the last born) didn’t realize years matter. So, by this definition, I’m an only child. That’s very interesting to me.
I played with this concept a bit in one of my series. I’m looking forward to your posts to gauge how well I did. Thanks, Gwen.
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As the firstborn, the baby was always my dolly. I wonder if that was true in your family as well, Staci. Birth order theory is fascinating and sometimes explains family dynamics that linger. Anyway, it’s interesting to explore. 😊
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Ha ha. No. Not even close. I was more of a voodoo doll to poke pins in when I was young. (Thank God, for the most part, that’s changed.)
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Thank you for sharing. Much appreciated. 😊
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Very interesting. Being born to a large family, I’ve found there’s no particular order. The older ones want to support the younger ones, and the younger ones want to return the favour when they get older.
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Thank you for sharing your beautiful experience, Jude. 😊
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Reblogged this on Chris The Story Reading Ape's Blog.
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Thank you, Chris. Much appreciated.
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My pleasure, Gwen 🤗
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As an almost only child, I don’t think I have ever thought about sibling relationships. Not personally anyway. I have watched others, and their complications always leave me confused somehow…
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Thank you, Jaye. I can see where you might be confused, especially if you come from a small family. I’ve six younger siblings, and birth order affected many of the dynamics in the family. Whenever we meet, we talk about our childhood experiences. The same situation, experienced by the oldest, middle, and youngest, varies from one to the other. We see through different eyes. 😊
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It sounds like a totally different world to the one I grew up in…
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As the oldest of five daughters, I can tell you it matters. The interesting thing to me is that I left Mexico permanently in 1969, and left behind four younger sisters – and the oldest of those four is now, for all essential purposes, the matriarch. I think she does a far better job than I would have.
The male/female order is important, as well. I might have been worried that a younger brother might supplant me if one came along.
One of my main characters is a female only child – a former physician; the other woman has an older brother and an older sister; and my male main character has two older sisters who have married and produced offspring already (satisfying the parents’ wishes for grandchildren).
There are only so many combinations and orders especially if you restart when the gap is a certain number of years, which is why patterns seem to develop. You can peg a lot of character development on the little quirks and the parents’ expectations.
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Thank you for sharing as you have, Alicia. I’m the oldest of seven, and my sibs and I are about one year apart. The responsibilities I had as eldest were quite different from my brothers and sisters, as were the expectations. Effectively, I was the second mom. When I’m with my brothers or sisters, our conversations will often return to our early years. As older adults now, we recognize how we were shaped by circumstance, and also by how we fit into the birth order. It’s fascinating. 😊
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I was second mom, too! My mother was not happy with having put on a few pounds (with 8 pregnancies, it would have been amazing if she hadn’t), so ‘family’ photos have me in the center, with her youngest on my lap, and the other three sisters distributed. We had one taken every year – just the five of us.
We have those pictures now because Mother always insisted on taking them. She loved having the whole family in one photo, too. I miss her.
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Reblogged this on Kim's Musings.
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Thank you for the reblog, Kim. Much appreciated.
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