I'm not a grandparent, just a mom. My kids are 18 and 15. We/they see DH's parents at least once a week when we go to their house for Sunday dinner, often more. ILs live about 5 miles away from us and come to soccer games, track meets, school events, etc, and they stop by our house if they haven't seen us for a week or so. FIL used to come by the house a couple times a week with donuts, but had a really bad accident last year and is no longer able to drive, so he only comes now when MIL does. We pick him up and take him to the kids' games and such if he feels up to going. They don't talk on the phone much but they do text with MIL.
As far as my "parents", they live about 20 minutes away. I was raised by my grandparents, and we saw my papa at least once a week, he came to the kids' things, and we went to his house; my momma had been in a nursing home since the kids were very little, but they did visit her there with my "mother". My papa died 3 years ago, and since then, my bio mother, who used to have my kids once a week when they were little and cute, has contacted us twice in the last 4-5 years (before papa died). Once she showed up at my house because she was having surgery and wanted to see "her grandbabies" in case she didn't wake up from surgery; they hadn't heard a word from her in 2 years and it was very awkward. The other time, this past Christmas, she brought them money because "she hadn't seen them for a couple months and didn't know what they like anymore". DS15 took his envelope and said thank you and went out the door; DS18 couldn't really escape, he stared at her without saying a word and his envelope is still on the shelf unopened. I have no interest in seeing or talking to her and I will not subject my kids to her unless they want to see her. I have never refused to let her see them but I won't make the effort, and they no longer care to see her because they see how she really is now. They loved spending time with her when they were younger, but she basically started ignoring them. She has no idea what she is missing out on. I fully expect her to show up at DS18's graduation next month, especially after she sees in the paper that he is the valedictorian--after all, that is HER grandson, and she is sooooo proud of him, blah, blah, look at her. She is not on the list to receive an announcement/invitation and is not welcome at his graduation party, if she finds out when it is.