Well I'm married, and I get along famously with my in-laws.
My father-in-law is a computer geek like myself, so we have nerdy computer talks. And my mother-in-law has a great sense of humour. We badger each other in a joking way all the time. My grandma-in-law, who my wife is extremely close to, also loves me. She's a wonderful old gal, and I love her like my own grandma (If either were still alive, that is).
I even get along well with both my brother-in-laws! We're very different (One is a framer, the other is a full-time fisherman), but they are great, fun guys. So it's easy to get along with them.
Let me say that I never take for granted the fact that I have great in-laws.
It's a huge relief to not have any anxiety or worry about going to visit them.