From The New York Times:
“Having a Sister Makes You Happier”: that was the headline on a recent article about a study finding that adolescents who have a sister are less likely to report such feelings as “I am unhappy, sad or depressed” and “I feel like no one loves me.” These findings are no fluke; other studies have come to similar conclusions. But why would having a sister make you happier? The usual answer — that girls and women are more likely than boys and men to talk about emotions — is somehow unsatisfying, especially to a researcher like me. Much of my work over the years has developed the premise that women’s styles of friendship and conversation aren’t inherently better than men’s, simply different. A man once told me that he had spent a day with a friend who was going through a divorce. When he returned home, his wife asked how his friend was coping. He replied: “I don’t know. We didn’t talk about it.” His wife chastised him. Obviously, she said, the friend needed to talk about what he was going through.
This made the man feel bad. So he was relieved to read in my book “You Just Don’t Understand” (Ballantine, 1990) that doing things together can be a comfort in itself, another way to show caring. Asking about the divorce might have made his friend feel worse by reminding him of it, and expressing concern could have come across as condescending. The man who told me this was himself comforted to be reassured that his instincts hadn’t been wrong and he hadn’t let his friend down. But if talking about problems isn’t necessary for comfort, then having sisters shouldn’t make men happier than having brothers. Yet the recent study — by Laura Padilla-Walker and her colleagues at Brigham Young University — is supported by others.