I interviewed more than 100 women about their sisters, but if they also had brothers, I asked them to compare. Most said they talked to their sisters more often, at greater length and, yes, about more personal topics. This often meant that they felt closer to their sisters, but not always.

I have two sisters; one is two years older, and one is eight years older. That helped me understand how completely different sister relationships can be.

Sisters, to me, are fascinating because it is a unique connection of the coming together of connection and competition. The fact that you have these age differences is a built-in power struggle, and the fact that you're all trying to get attention and resources from the same parents creates competition.

Deborah Tannen Quotes