I can relate with this especially children from polygamous home,it can really be daunting to be born into an abusive, violent or nonchalant attitude home towards member of the family.
This is what parents don't know,the expose the young minds(kids) to all sorts of pain and because each person has a certain threshold for pain ,it could either make or mar their childhood and life's journey.
All the same life must go on,try to seek professional help from experts.
Brace up and try to live above such pains
Try to live better so that such trend wouldn't continue especially with your own kids.
You can seek closure from close friends,you can let out the pains and close that chapter of your life.
Don't forget to let your heavenly father heal you completely. Pray to him.