My boyfriends mother is a absolute 😡😡😡😡

My boyfriend who is 23 lives with me and she is forcing him to move back to her house.

She is saying that if I don’t kick him out she will report my mother to the social workers because our house is messy apparently when it is not , also said to my boyfriend if he doesn’t move out she will take all of his money that goes in her account and get me arrested for refusing to let him move out ( which i am not )

What should I do. I genuinely think he’s going to leave me.

I think she hates me because I let him be his own person. I don’t control him or be nasty to him. He has autism so she thinks he is a crippled mental person when he really isn’t

Update he has his own bank account and a job so he has some money but he also gets pip ( benefits) which go into his mums account because she is his “carer”