Teenager living at home. Just came back from a country where he is required to quarantine on her return.
I can see from my activity tracking app that he is out running.
I don't know if my sister (his Mum) knows and even if she did if there is much she can do, bar locking him in her room or chucking him out.
Do I have some sort of duty to say something or shall I just keep out of it?