I have 3 boys. The advantages are tremendous over having only 2. For one, you have a democracy. What movie, what kind of ice cream, everything can be put to a majority vote (of course I have veto status). The other thing is, when I was growing up my brother and I would conspire and get away with all kinds of crap. Not so with 3. There is always going to be a weak link, one of them is always going to rat the other two out. Plus if two of them are arguing/tattling, you can usually get the real story out of the 3rd. I see nothing but advantages. I wish I had one more sibling growing up.