Boyfriends family and I have issues

So my bf and I have been together for 4 years this coming November. The summer before he went away to college his grandparents (he lives with them, dads side) told him to break up with me. Even his aunts and uncles told him to as well.

When he came back from college they still pushed for him to date other girls. When I went away to college, he wanted to come visit me.(I’m a year younger than him.) so her response was “yours not allowed to sleep in the same bed. You have to rent a hotel room. I’m sure her mother wouldn’t be okay with you sleeping in the same bed”. He explained to her how my mom asked if he was gonna sleep in the same bed and she was fine with it. She joked saying not to do anything “dangerous” in bed.

She’s said to him how he should be able to take other girls out to movies, how it’s not cheating.

She talks bad about how I dropped out of college to goto cosmetology school. Called me a whore because we shared a bed, and she’s found me on his bed playing uno with his friends and him.

She’s told him he cannot marry me. That he can’t have kids with me.

Tried to put me against his mother. Told me lies about my bfs past.

I help his grandparents out when I can. Errands, planting, cooking, fixing computers, decorating for holidays, etc.

Well last year I was getting super fed up. His grandmother wanted him and I to get things for his cousins party, I bought her gifts and everything. Well, I wasn’t invited. His grandmother said I can’t go it’s his cousins party. But my bfs friends were allowed to go, and didn’t bring gifts. My bf messaged his cousin asking if I can go and she said she finds me creepy, that he can survive one day not seeing me. That we shouldn’t be together. How I stalk him because we had the find my friends app when in college for when we were visiting each other to make sure we were safe. (His grandmother tells the whole family about what she thinks or hears about my relationship.) they say I don’t trust him because I have the app.

They keep on trying to force him to take me over there. How his cousin is sorry for saying what she did.

But his grandmother just wants to forget all of it. That she didn’t do anything wrong. How if I marry him, I’m marrying his family as well.

How would any of you deal with this? (His Mom and dad separated when he was young. Abusive father, Mom poor and couldn’t pay for the school my bf needed to goto for dyslexia. So she got custody for money reasons. Also grandmother wouldn’t let him see his mom on mother’s day ever.)

Edit: my bf has argued with his grandmother for years about me. Even last night, because we ran into his dad who just came back into his life. And we have come to find out his dad had a child before my bf and everyone kept it a secret but his grandmother decided to tell him.