during social distancing. She was specifically talking about single people who live alone in big cities but to an extent the same can be true for your teenager.
She said that one form of health is not more important than another. So, speaking to single people living alone, pick a small group of friends and call them your family. Eat dinner with them and do all the things together that a family would do together during this time. The important part is not going beyond that group. If there was a couple friends your son could do that with it might help and not really put anyone at risk.
I'm not sure what I would do in your situation though. Good luck.