Meeting his parents

Mel

So I’ve been in a relationship with my boyfriend for almost 6 years, we started dating junior years in high school and i still haven’t met his mom and dad yet and at first i know why he didn’t want me to meet his mom at first because she’s an alcoholic and drinks a lot and gets “crazy” and blames things on him i guess you can say, idk the whole back story to that but i know he’s always worried about his parents buuuut he’s moved out of his parents house and his parents know about me but idk what i should do? Should i put my foot down and tell him something?