Ask Iri, He's Great With Girls (Need Advice? Ask Me Your Questions)

Hi Iri, Im actually a girl asking for boyfriend-problem solution.
So the story goes: His sister and his mother doesnt really like me, the beginning is that Im a foreigner and they (Italians) are quite hard on people from outside. I have failed to make his mom happy as Im not used to gossiping and I like my space, time... She freaked out on my bf that she doesnt want me there because I drink coffee on the stairs and I dont chit chat with her as much as she wants to... That Im too serious.
She continues to forbid him to see me (hes 33) and she makes scenes when we visit for weekend. Now my bf is in a tough situation, as shes unveiling to have any relationship with him if Im in his life...
What could I do?