Hi Rosewine. It's ok to decide that you can't put up with it. I was in exactly the same situation (minus having a DD, but I have a lovely DS).
We owned the house 50:50; we put it on the market and weathered it out in separate bedrooms (until it all got too much and I ended up leaving to stay in temp accommodation).
But, 6 months on, DS and I are peaceful, happy, nobody is causing arguments, no EXW trying (and succeeding) in breaking up the relationship using the children as proxies and the truly hellish conflict that caused between me and exP.
We had months of counselling but in the end there was no way exP was willing to allow me to be afforded any room as another equal adult - not confronting his kids is and will always be his priority rather than setting expectations of behaviour for them in what was our home.
I lost thousands of £ but it was worth it for the peace we now live in.
I started with 12yo and 10yo SDs, lasted until they were 16 and 13, when the ugly behaviour was only getting worse and worse.
If you have tried speaking, writing and using a counsellor and nothing is changing, please don't worry about leaving. Making your kids feel secure is the most important thing. You have the right to a peaceful life.