Well, I'll put in a contrarian view: two boys and a girl.
One boy, by far the easiest, the girl, almost as easy to raise, but the other boy. . . .
It's difficult to generalize from small samples, but folks love to do it. The "boys are this way, girls are that," coming from a parent who has one of each, and universalizes their experience of their own children to all children of that sex, is heard far to often.