He basically has not one ounce of respect for you.
And it will not change until you REFUSE to accept it.
You won't do this I guess - but I would be taking leave from work, and packing a bag. And disappearing for at least two weeks. If you have anywhere to stay with friends where you can go to work from there, that's what I'd be doing. And telling him that you have no intention of spending that month doing any if his childcare.
Drastic? Yes. You have tried discussing, and it didn't work.
However, is there any point to that, even? What you have here is one of the many men who, post split, seem to think that 'moving on' merely involves getting together with a different woman and slotting her in like a glorified domestic appliance, conveniently plugging the gaps left by his new living arrangements. You aren't really a person - you know, with opinions, someone else who actually has to give permission for something to happen on the house she lives in and pays for. All that adjusting, shaking down, arranging- he's already done that, with his ex. He has his arrangements... you are Mark II, the other half of the partnership is actually still the mother of his child. The other humans are just who they've always been - his mum, other family. You are, somehow, lesser than all of them. Because all the growing up and becoming sorted was done before you were slotted into the already complete picture.
Lots of men seem to be like this. It won't change, EVER, because (especially) you have for some mad reason accepted it up til now. The time to explode was probably years ago, certainly the first time he made arrangements for YOUR life without consulting you.
If you want a true partnership in which to have a family, I would move on right now.