If you don't want to end it, I'd at least insist meeting them. I would find it offensive to be with a man for a decade and not knowing his family. I'd want to see their house and how they really live. I'd be offended that he kind of keeps you a secret. But I wouldn't confront them about how they treat their son as first of all he is s grown man and makes his choices and you only know his side of the story. I'd certainly insist on meeting them after that many years