Strength to stand against evil and protect her children

My daughter's BF and father of her children is an alchoholic and mentally unstable and a manipulator and control person. He is horrible to the oldest son who is nine only. He belittles him, bullies him, blames everything on him and yells at him and cuts him down. He has called him names, (faggot) and cursed at him. He drinks and verbally abuses everyone – we all walk on egg shells around him, his family caters and enables him because they want a normal prson It has just created a monster that should be in-patient and getting help and not around young children or my daughter. Please pray he seeks help himself or packs his bags and leaves never to be heard from again so he can do his own thing. He has made a lot of money this year and refuses to help pay for familial expenses, my daughter works 3 jobs to pay for everything and he does what he wants spends on what he wants and my daughter has to take care of the apt and the boys . He needs help and should not be around a family that he is emotionally destroying, pray it does not turn physical as he it capable of that.