First, I want to be supportive of OP b/c it's such a personal decision as to how many kids you want. Second, I have lots of friends who are onlies and they are great people! However, just want to give my perspective as the last of 4 since OP seems to want differing perspectives. I happen to have a great relationship with my sisters and brother. We are spread all over the country, but see each other at least once a year during the holidays. We call regularly. It's nice to have people who share the same memories as you (and remember things about your childhood that you forgot!), who are there for you, and who you don't have to be anyone but yourself (even if that self sometimes regresses back to when you were all 12 years old). My parents were older when they had me, and when they died, my oldest sister ended up doing much of the work since she was in the same town as them. It was hard for her and she was sometimes envious that we couldn't help b/c we were far away, but that's the way it goes. Now that they are gone, I think we all cherish the fact that we have each other. NOw that I have kids, I love that I can compare stories and experiences with my siblings about child rearing and taht my DS will have cousins to play with. We have a set of distinctly older cousins and my DS constitutes the youngest of the young set of cousins. It was really special for me to see the older cousins play nicely with the younger cousins this Thanksgiving and continue to build the sens of family that we have. Maybe I have something rare these days given the rest of the discussion of how people don't get along with their siblings, but I do want to throw a different perspective out there that not everyone with a brother or sister has a strained relationship wtih them, negating the reason to have a sibling for your child.