Ask for outside help. I would also add extended family members such as grandparents, aunts, or uncles. An important theme in the book is to keep telling if someone doesn't listen or discounts what the child says. Children are also encouraged to call an abuse hotline themselves to get help for their families. These agencies are listed under different names in different areas.
Children can always call their local police station as well.
All children should know how to dial 911 if they witness serious violence in the home. Find ways to nurture themselves. Children living with domestic violence experience intense stress. The better able they are to find ways to nurture themselves, the better able they will be to cope with that stress. Davis also says that children from violent homes usually need help learning to deal with anger or other intense emotions without hitting.