Often girls unknowingly learn what to accept in what they observe in how their father interacts with their mother. So something dysfunctional can seem normal when it is not. The same can be true for either a boy or a girl as often boys can think a dysfunctional behavior pattern their father may be expressing with their mother is "normal" and acceptable. Unfortunately that is often how dysfunctional relationships can become handed down from one generation to the next. Often an individual is what they know how to be.

It can get pretty complex.