Well, it's kind of unusual, but nothing wrong with that. Sorry you've gotten grief over it; it's really insensitive for people to complain to you about what your parents did. What do they expect you to do about it?
One of the ladies I work with has 7 siblings, and one of the families at my church has 10 kids. Mostly families are smaller than that, but 3 or 4 kids per family is still very common. Me, I'm afraid I wimped out and stopped at two. We had thought about more, but our son's autistic and that's partly a genetic thing, so we didn't want to risk it.
I'll bet you have some great crowds at holiday times
PJ