I an very close to my family. I am probably not as close as they are to each other, but I talk to my mum a couple of times a week and my sisters at least once. I see them regularly probably once every two weeks at least.
DH doesn't really have close relationships with his family. He sees them but doesn't really regard the relationships as that important. Where as my family are very important to me.
The problem is he is very resistant to spending time with my family. He always complains if I suggest visiting them. If we go out he is often withdrawn and spends most time playing with the kids rather than talking to the grown ups.
Before people start shouting about him trying to isolate me this is not the case. He has no problem with me going alone or with the kids. His logic is that he works hard and is old enough now not to have to do things he doesn't want to. He does work hard. So weekends are our only family time so I don't like taking the kids off and leaving him alone.
Also my family are very inclusive. I think they are hurt by his obvious resistance to joining in family events, bbqs etc. often my mam will ring with suggestions of upcoming festivals, activities etc that the kids would love. DH never wants to go. Sometimes he'll refuse outright, or he may reluctantly agree but be clearly miserable.
He doesn't dislike my family. He is not a people person really, and there are only a few people he likes to spend time with. He doesn't like people coming to the house either (when he is here, he doesn't care when he is not). My home growing up had a very open door policy with loads of pop in visitors. DH cannot bear this and gets incredibly irritated if people suggest calling in at short notice or just show up. This applies equally to his own friends and family.
I usually pick my battles on these things and insist on the ones I think are important and try and put off the others until he his not around or I can meet them somewhere else.