Does Having Sisters Make You a Happier Person?

The New York Times recently delved into an interesting theory that adolescents who have sisters tend to be more optimistic, and happier people. Growing up with an older brother, I admit I have wished I had an older sister as well, since it seems like we would be able to relate more as girls. But I'm doubtful having a sister can bring you more happiness, per se—it's just a different kind of relationship. Readers, what do you think? [via The New York Times] Photo: stock.xchng