Is it normal to break up with boyfriend because i hate his family?

I love my boyfriend but his family aggravate me and make my blood boil every day of my life and I can't take it anymore.

His Mother is a white trash woman who lets her underage year old children watch R rated films and TV shows where there's tons of full on nudity, drugs, swearing, etc. She also gives her children beers and encourages them to drink. Last time I was over, I was forced to sit through a movie with her children where a woman was a prostitute and drug dealer. Then I was offered beer along with her children while she swore in front of her kids when we ate dinner at the table. She said "I'm so f*cking pissed off at my boss. I want him to f*cking die." and then one of the kids said, "I hate a**holes." and she smiled and said "me too"

I can't take this kind of behavior nor would I ever condone it so to be in her presence makes me sick. He lives with her but he was mostly raised by his Father (they divorced when he was a little child). Her two other children have two different Fathers as well so she obviously isn't able to maintain a relationship.

I don't know what to do. I love him so much but I hate when she calls me and uses all these swear words. I asked her to stop, she won't. She dresses in provocative clothing sometimes and she's mid-fifties. Her kids are growing up just like her because one of them wears make up already at 10 years old. She has about 20 pounds of it on and wears low cut shirts.

I don't know what to do because he says he loves his Mother so much but I keep telling him how I feel and he just says she's my family, I can't change her. I am pissed.

IIN?