Do you view your in-laws as YOUR family?
I get on with mine well, but I can't help but think of them as DH's family, not mine. Yes, they are undoubtedly my DC's family, but I just don't view them as mine. I often find myself referring to my SIL's DD as 'DH's niece'. I mean nothing by it and am not consciously trying to dissociate myself, I just see it as his side and my side.
Was reading a thread earlier about how much contact adult DS have with their mothers, many posters said that their DIL's message them regularly. I very rarely contact my MIL. In fact, other than to wish her a Happy Birthday, Merry Christmas, etc. Or thank her for a gift, I leave all communication to DH. Likewise, he wouldn't randomly txt my side of the family, other than to put a meme or something in the family WhatsApp.
How close are you to your in-laws?