I was going to have 4:
1 - Gets spoiled (I now have proof of this <_< )
2 - Each is a favorite of a different parent
3 - Two are favorites of a different parent and one gets left out
4 - Two are favorites of a different parent and the two who are left out can hang together
I have two different friends who have 7 kids each and several who have 10+ siblings. I think big families are great