It depends on the age, family stress, how the kid deals with stress, the parents, and so on.

I'll give you a good example. I have two girls the same age. Both went through divorce at the same time. One is mine and the other is my wifes. We both have custody now. My daughter internalizes everything my step-daughter does not. Mine was and is a missy divorce my wifes was easy and we get along with the X. My daughter has sever stress related issues and but the other adjusted just fine.