What would you do?

I know it's relatively normal for most partners to not get along with their in-laws! But mine are such two-faced trouble makers.. My partner & I have been together for 2 years, his crazy ex had made fake accounts impersonating us and doing alot of other things like threatening me and stuff! So eventually I went on to confront her and we ended up in a fist-fight. My mother in law hated her, same as my sister in law.. But when they heard about the fight they were all the other way! They picked her side not even only over me but over they're own son/brother.. My partners sister messaged him saying that she wanted nothing to do with him and that he is not family to her! and his mother kind of did the same (not as harsh) they both sided with her and it went to court and it came out that the ex was the liar and made up lies in every part of the statement she made against me, she got away with most of it because the cop sleeps with her niece.. His married mind you! 😷😷 my partners ex is now good friends with his sister even after she had cheated on him and everything and his family knows that but still sides with her... We stopped talking to them for a good 6+ months. But his mum & sister have turned his brothers and sisters  against him... By making them believe that we are the liars! I don't understand them, they do my head in.. I messaged his mum yesterday and told her that if she apologised and that I would forgive her!!! Just not the sister because she's still friends with his ex. Well she said no that she's not apologising because she never took sides and helped his ex but she did... She sent her anything she could to use against me in court and stuck up for her this whole time! I don't like them and I despise them for this but it's hurt my partner a whole heap and he can't hold grudges.. I don't know what to say to him or how I can help him through this! they are just being so horrible to him. His brother whom he was close with (his 22, partner is 25) is having a baby and he asked my partner to be godfather which I'm fine with but throughout the whole 6 - 8 months he has not spoke to my partner not once asked how he was going, not once wished him happy birthday! but messages him expecting to act like everything is fine. The older sister has a big influence on the younger brother which is 22.. And she's the reason they haven't spoken. I want my partner to be happy but I can't handle how two-faced & backstabbing his family really is and I don't know what to say to him about this. His mum won't even apologise to him even after his asked her too, but he wants to talk to her again... After all of this. 😪 I know she is still his mother hence why I have gave her chances to apologise! and sort things out.. But she just loves the drama waaaay too much.