I have an older brother who, despite the occassional wars we have, is always there for me when I need him.
I can't imagine what it would've been like to grow up without always having someone there to depend on. I doubt I'd ever have played Final Fantasy if it weren't for my brother...or learned what kind of rims look good on a 350z.
Sure we fight and bicker and throw things at each other, but if anything, I'd want more siblings. It would've been so great to grow up with like 4 brothers and sisters. ^_^