Just to preface this that I get on well with my PILs. They're lovely people and very caring towards my 3yo. However, MIL is having a slight moan that she never gets to speak to or see DC at the moment - they live in the north of England and we live in the south-east so obviously with Covid they haven't seen him since around October last year.
My parents are in the same situation (they also live around 4 hours drive away from us so we haven't seen them for months). I do, however, video call my mum either on Skype or Zoom once or twice every week so she can talk to DC and watch him play. At the weekends, we do some sort of activity together (painting, colouring in, cooking etc.) and I prop my tablet up so my mum can speak to DC while he's doing it. They chat and he gives her a running commentary on what he is doing. We find this works better than doing bedtime stories since DC is usually exhausted by bedtime and so doesn't really like having to chat to his granny then - he just wants to cuddle up with me. Having an activity to do means he actually stays in one place for the call rather than running off.
I've told my DH to organise some video calls between DC and his parents at the weekend, but DH can't be bothered. He isn't great at getting involved with activities for DC, although he'll take him to the park or playground quite happily, and his idea of looking after him in the house is turning the TV on. He does work hard during the week, so I don't give him too hard a time about this, but I also work 3-4 days a week and don't really want to have to sort out and supervise two sets of grandparent video calls at the weekend. Is it unreasonable of me to leave PIL contact with DS for DH to sort out? I should say that I already send them regular photos and videos of DS, so it's not like I ignore them.