Madcap theory no. 2382: I know that many children in abusive families live with the feeling that they will have to rescue or protect their mother. I wonder if the little girl who never takes off her coat has a knife under there? She's going around fearing that she'll have to save her mother from her father one day, but perhaps she'll end up stabbing the pharmacist or a gangster.
I like this idea @EsmaCannonball - I'm sure that child is going to be significant somewhere here.
Like another poster, I've wondered about the effect on very young children acting in this type of drama. I'm sure that they are well protected - perhaps they have their lines, and the adult lines (muffled screams through the door) are dubbed in later. I hope so. I was brought up in quite a violent and chaotic family myself and some of this stuff has had me in tears.