For one set of grandkids, our son and his partner...its facetime everynow and then, plus we have done an odd drive by to drop stuff off when theyve run out of something. Generally contact via FB.
Other son, wife and grandkids pop past on their exercise hour everynow and then, knock and we chat at a safe distance for 10 minutes. Otherwise its FB messaging.
Daughter, we chat on the phone etc.
Mum, 90, I pop in twice a week, wash on arrival, dettol my hands then hygienic wipe everything I've touched as much as I can plus keep as much distance as possible.. She is used to being on her own but I can see she is struggling a little with the isolation, plus she is very unstable on her feet so I hoover up etc. I probably shouldn't be doing what I am but she needs someone to make sure she is as ok as possible. Ring her every day for 15 minutes or so.