by Mandy Van Devin
Sometimes a family tragedy can expose bonds you didn't know existed. That's what happened with my younger sister and me. Although just 11 months apart, we could not have been more different: I rebelled as hard as she conformed, and if you met us at a party ... well, that would never have happened, because we never went to the same parties. If we hadn't been forced to spend summers together with our dad after our parents' divorce, my sister and I would have spent scarcely any time together at all. Then my mom was diagnosed with Stage IV lung cancer and given less than a year to live. Suddenly, for the first time in our lives, my sister and I were not only inseparable but totally in sync.
Some patterns came naturally, since they were holdovers from when we were kids. Negotiating household chores was a breeze. I agreed to wash the dishes if she would dry and put them away. The next night, we swapped duties. Other moments of synchronicity caught us by surprise, like realizing we both avoid dealing with our emotions by taking on more responsibility. During the nine months my mother fought a losing battle for her life, she found joy in watching her daughters put aside their childhood differences and learn to appreciate each other as adults.
In "The Sibling Effect," science writer Jeffrey Kluger argues that the relationships we have with our siblings are the most important ones of our lives. From the time we gain a brother or sister, they can be both our fiercest competitors and closest confidantes. They teach us the social skills we carry for life and stand by us during our best and worst experiences -- divorce, the birth of children and our parents' deaths. In his book, Kluger uses the latest scientific findings to explain the meaning of everything from birth order to the stigma of the only child.
Salon spoke to Kluger about the enduring loyalty of siblings, why treating children the same is a bad idea, and the problem with being the middle child.
When you were researching the book, were you surprised by how intense the sibling relationship is?
The relationships I have with my siblings have always been very important in my life, but it wasn’t until 2005 that I began reading a lot of papers on the topic. The value and centrality of sibling relationships across the board was surprising to me, particularly because a lot of these dynamics are very deeply encoded. So many of the sibling dynamics we find in the home are replicated in the natural, non-human world, and so much of what I found is universal across several hundreds of species. When you get up to humans, we’ve embroidered and built on these dynamics in all kinds of elaborate ways, but human sibling relationships are deeply rooted into the evolutionary chain.
Is this why you make a strong case for people staying close to their siblings?
One of the reasons I made that case is that there is a real uniqueness to sibling relationships that people never fully appreciated before. Siblings are the only relatives, and perhaps the only people you’ll ever know, who are with you through the entire arc of your life. Your parents leave you too soon and your kids and spouse come along late, but your siblings know you when you are in your most inchoate form. Assuming you all reach a ripe old age, they’ll be with you until the very end, and for that reason, there is an intimacy and a familiarity that can’t possibly be available to you in any other relationship throughout your life. Certainly, people can get along without siblings. Single children do, and there are people who have irreparably estranged relationships with their siblings who live full and satisfying lives, but to have siblings and not make the most of that resource is squandering one of the greatest interpersonal resources you’ll ever have.
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Sometimes a family tragedy can expose bonds you didn't know existed. That's what happened with my younger sister and me. Although just 11 months apart, we could not have been more different: I rebelled as hard as she conformed, and if you met us at a party ... well, that would never have happened, because we never went to the same parties. If we hadn't been forced to spend summers together with our dad after our parents' divorce, my sister and I would have spent scarcely any time together at all. Then my mom was diagnosed with Stage IV lung cancer and given less than a year to live. Suddenly, for the first time in our lives, my sister and I were not only inseparable but totally in sync.

In "The Sibling Effect," science writer Jeffrey Kluger argues that the relationships we have with our siblings are the most important ones of our lives. From the time we gain a brother or sister, they can be both our fiercest competitors and closest confidantes. They teach us the social skills we carry for life and stand by us during our best and worst experiences -- divorce, the birth of children and our parents' deaths. In his book, Kluger uses the latest scientific findings to explain the meaning of everything from birth order to the stigma of the only child.
Salon spoke to Kluger about the enduring loyalty of siblings, why treating children the same is a bad idea, and the problem with being the middle child.
When you were researching the book, were you surprised by how intense the sibling relationship is?
The relationships I have with my siblings have always been very important in my life, but it wasn’t until 2005 that I began reading a lot of papers on the topic. The value and centrality of sibling relationships across the board was surprising to me, particularly because a lot of these dynamics are very deeply encoded. So many of the sibling dynamics we find in the home are replicated in the natural, non-human world, and so much of what I found is universal across several hundreds of species. When you get up to humans, we’ve embroidered and built on these dynamics in all kinds of elaborate ways, but human sibling relationships are deeply rooted into the evolutionary chain.
Is this why you make a strong case for people staying close to their siblings?
One of the reasons I made that case is that there is a real uniqueness to sibling relationships that people never fully appreciated before. Siblings are the only relatives, and perhaps the only people you’ll ever know, who are with you through the entire arc of your life. Your parents leave you too soon and your kids and spouse come along late, but your siblings know you when you are in your most inchoate form. Assuming you all reach a ripe old age, they’ll be with you until the very end, and for that reason, there is an intimacy and a familiarity that can’t possibly be available to you in any other relationship throughout your life. Certainly, people can get along without siblings. Single children do, and there are people who have irreparably estranged relationships with their siblings who live full and satisfying lives, but to have siblings and not make the most of that resource is squandering one of the greatest interpersonal resources you’ll ever have.
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