Using Instagram

Luckygirl3 you'll be able to see the videos/pictures your grandson posts without having an active account yourself if you don't want to post anything.
I do this with the pictures my daughter-in-law posts.
I also occasionally look at what my MP has posted.

Of course, same as FB

NannyJan53

I use Instagram. Only people you accept to follow you can see your posts.

Only if your account is set to private

I use Instagram. Only people you accept to follow you can see your posts.

just keep your account private. then no-one can post on it