Asked a chick to prom in high school. A couple of days later I drove to her house and met her parents who were gang quality people. Her dad was in his 40s and sat on the far end of the couch. I was constantly darting my eyes over making sure he didn't pull some shit. Her mother figure had to have been in her 20's so it must have been her step mom or something. They were really rude, the house reeked, and their hair seemed to have not been washed for weeks.
I was scared for my life. When I left I vowed never to go back into that house.
But when prom came around, it seemed like they turned into different people. They were really respectful, and nice. I felt bad to judge them like that. Her mom dressed up nice and I took this picture of them together!
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It turned out great. We had a really nice time after prom too if you know what I'm saying. Her parents were cool and accepting of it, they obviously heard it!
A few days later she texted me asking if I wanted to go with her and her dad up to go fishing. We went, me and her dad talked about the sex, he padded me on the back and said, "I'm glad it was you son. If you ever get kicked out, know that you have a home with us."
Since then the family has been close friends of mine, I'm always bouncing ideas off of them and they give me advice. I'm now tutoring her mom because she wants to get her high school diploma. It gives me a purpose in life to help these people out.
So OP, if you are going to judge you're girlfriend by her family you can, but it might come back to bite you and you may be very wrong when you get to know them. Get to know them, no matter how odd it is. Just don't go into their basement, there are definitely dead bodies down there.