Separate or keep arguing?🤔

My husband lived with his mother and little brother (which is a year younger than me)

A year ago his mother passed away so his brother stayed living with us but her drives me crazy. He doesn’t buy his food, he doesn’t want to pay bills. He works a little more than my husband but in the same jobs. He receives packages like 2-5 times a weeks. He doesn’t pick up after himself. I have been arguing with my husband since last December and I tell him to tell his brother something but all he does is ignore. If I tell him something he ignores me too so I want to leave my husband because of his brother. I don’t know what to do anymore