"This man terrorises and abuses his own children. They are already damaged by his behaviour. He doesn't even deserve to be referred to as a dad. He is despicable."
This with bells on.
Does your daughter know the importance of telling the truth to the police. Will she back you up?
Do the kids love their dad?
Or are they just scared of him?
" He's generally a dad but has an awful temper and he goes 0-100 in a split second with any of us. Regularly to the eldest dd too."
I'd be scared of him.
Does your daughter look like you, is he taking his anger at you (for whatever, who knows!!!) Out on your daughter? What about the other kids?
When you said previous physical abuse and mental torture, can you name it? Did it include rape? I am so sorry to ask that. I am sorry if this is too personal, feel free not to answer of course.
Did yot marry because you were pregnant? Did he want that?
You see it just sounds scary you married so young and had four kids that's kept you at home and out of work and made him the king of his own castle/empire.
Whose idea was it to have 4 kids. Again I am sorry if this is too personal, feel free not to answer of course.
It may all be innocent, you got pregnant and both wanted to marry and both wanted four kids.
I just think that a man that can physically abuse you and mentally torture you, go from 0-100, especially around his teenage daughter and hit you across the face in front of your daughter is someone who has no place being around children, anyone's children, not even his own. You've been so abused you cannot see how incredibly bad this really is.
So I would want women's aid and the police, and s counsellor to help you see really how abusive this man is, all those people on my side backing me up that my family is at risk from this vile man.