My in-laws are gone now, but I used to call them, they called us, DH would stop in during the course of any given week and chat or drop something off & I would do the same. I never got into the "they're his parents so he should deal with them" mindset...once I married DH, his parents belonged to both of us, as do mine. They were just a part of our lives...we didn't feel obliged to call them every day, because just in the course of our day to day life and dealings, one or the other of us usually did speak to or see them daily, or at leats fairly regularly where I don't think they felt ignored or neglected. But we also didn't do an "obligatory" once a week call...we all jusy existed together, getting in touch when we felt like getting in touch or when we had a reason to get in touch. I am thinking that because they knew we all existed together, they didn't get that "you never call me" attitude, because they never got the vibe that it was a chore to call them or stop by or whatever.... I had a very easy relationship with my in-laws. Overall, they liked me and I liked them. They gave me the greatest gift of my life...the man who is my husband.
Our relationship is the same with my parents. As my parents have aged (they are both in their 80's now) I make it a point to check in with them daily, I usually see them at least once a week, DH will stop by if he is in their neighborhood and have a cup of coffee with them. I like to be in touch daily because they are older, and while they are independent, I feel like being in daily touch might be valuable in picking up on something that might be going wrong. My brother also calls or stops in on a fairly regular basis. He lives a little farther away from my parents than I do and has a killer commute for work, so he contacts them slightly less, but still fairly regularly and is always there when they need something. I'm about 10 minutes fomr Mom & Dad (7 if I hit the traffic lights the right way) so I just have more opportunity to see them & pop in. Brother & I have kind of divided the worklaod...he handles the household stuff (leaky pipes etc) that my parents can't handle on their own and I handle medical issues. Like I said though, while my parents are slowing down, for their age they are still great...live independently, manage their lives, Dad still drives. They actually require very little of us.
DH's parents died young...they were both 69...and they were both healthy independent people who got cancer and died, so there wasn't the sort of slow "failing" or "slowing down" that we are seeing with my parents. If DH's parents were still alive now, they'd be close to 80 as well, so we'd probably be checking in with them daily as well, to keep an eye on all the old people!
When I read some of the in-law posts here, I feel very fortunate....