Read this, OP:
“After I moved in, I realised that DP has issues with alcohol
drink heavily between shifts.
he can be nasty at times and will start arguments at any slight, real or perceived.
He's drinking this evening (downstairs)
I'm upset at being "punished" by being told to sleep on the sofa. He knows I have difficulty sleeping downstairs,
I don't know if I'm overreacting by feeling upset but telling me to sleep downstairs because I forgot to scrape a tray seems borderline unhinged.
It's his house so it makes me feel like I've less of a say in matters.
he has sent me downstairs/into my sons room (when he's not there) before.
I've never said no if he's told me to leave. There would be no risk of him becoming physically abusive, but it would make him very angry. I do often placate him for a quiet life.
he told me if I didn't drop the attitude, "I'd be sleeping in the car".
“I'm going to go upstairs to bed, and you're going to sleep in your car".
I went upstairs shaking and basically waited for him to come upstairs to see what he'd do.
"you've no common sense, it was a joke.". It absolutely wasn't. This is why I'm especially upset about this evening as he knows how much this type of threat upsets me.”
These aren't our words.
They're yours.
You've put yourself, your little girl and your teenage son in an incredibly precarious position.
You're inflicting an abusive alcoholic on your children and yourself.
His language towards you suggests he thinks he is something between your bullying father, owner and boss.
You tell us he threatens you, knowing how much it upsets you.
You are walking on eggshells - you tell us you were shaking, waiting to find what he'd do when you disobeyed him.
You daughter is learning this is what happens to women.
Your son is learning this is how to treat women.
Alcohol destroys lives, families and minds.
And placing children in danger from an abusive alcoholic can lead to women having them taken away.
Do you have a job? Savings? Pension?
Any form of security that is not entirely under his control?
Does your son's father know the situation his son is in?
Do you have parents, siblings, friends you might turn to?
You have a hard decision to make to protect your children and yourself. This cannot go on. It's hard, but you have to be the adult, not the scared child. There is help and advice out there:
https://www.womensaid.org.uk/information-support/the-survivors-handbook/i-want-to-leave-my-relationship-safely/