Boys, late teens.
For the last 19 years one or both of them has been to tea with my parents on a Friday. A continuation of when my dad was my childminder when they were little and then collected them from school and gave them tea once a week while I worked. They have a close relationship which everyone seems to enjoy.
Once they got old enough that I didn't need a childminder, they still went for tea and they still did right up until lockdown 1
Once lockdown eased in the summer they went for a picnic tea in the garden.
None of this has ever been compulsory. I've suggested it but they've always been free to say no and have done when they have other plans.
They obviously haven't seen them for a few weeks so today I suggested they contact GPs and see if they fancied a walk, which DS1 dutifully did and DS2 didn't refuse 
Anyway, a friend has suggested this is odd behaviour and it's not normal for teens to want to spend time with GPs, that they must only be doing it because I "make" them, even though I don't think that's what I'm doing, I.e. they feel it's compulsory even if that's not how I intend it.
They seem to have enjoyed catching up with GPs and I often get snippets of their lives from grandma that they haven't told me. 
Should I stop encouraging it? The way I see it, it's good for everyone, although it's true they probably wouldn't bother leaving their computer games if I didn't remind them.