Is this relationship doomed?

I am asking this on behalf of my brother. My brother recently came out and is in a relationship with his first boyfriend. They’ve been dating about 6 months. His boyfriend has been welcome over to our house (our parents’ house) all the time, he comes to family parties, etc. He fits in very nicely in our family. The problem is, my brother has never met his parents. He has never been welcome over to his house. The boyfriend’s parents have forbidden him to move out with my brother and they take his paycheck to ensure that he stays. And the boyfriend won’t stand up to his parents. I’m just looking for opinions on this relationship because my brother has come to me for advice and I honestly don’t know what to tell him.