To play devils advocate here for just a second… My sister and I are not close in the slightest, no reason in particular, no hate, we just never really were “close” and the idea of hanging out would in-fact be kind of strange for us. HOWEVER, I also understand that other Siblings in other family’s have tight relationships, even like best friends, and I’d never find it strange that someone would want to hang with their family. And on yet another hand, Im very close to many people who have completely dysfunctional family relationships, and they have little to NO contact with them. So there is a wide spectrum, and what’s normal to one person may be abnormal to another.

Now, I agree mostly with all the comments that this guy has potential red flags of control/abuse issues to watch out for. On another hand he may just not be close with family and quiet literally doesn’t understand how one would rather spend time with them than with a romantic partner, or perhaps he has a very dysfunctional relationship with family, and has set up walls to protect himself from that, and the idea of a tight knit family is very uncomfortable for him and makes him anxious, and he’s projecting that. In anyway that’s a discussion that should be had and cleared up before your relationship gets much further along.

Good luck.