My six year old girl smart mouthed me in angry tone the other day and I smacked her little bottom faster than you can imagine. About 5 minutes later she humbly came to me and apologized. She is very strong willed but strong willed children often become very successful leaders. I'll let you know which way she turns out in twenty years.
It's all a crap shoot.
The worst of parents can have the best of children and vice versa. Sometimes kids just ain't right (thought I'm sure your will be just fine).
My favorite saying when people ask me why I don't have children? Kitty and Kyle Menendez had children once.