Different rules and attitude between countries and when you have a president in the USA that refused to wear a mask and also gave a strong indication at least until he himself was diagnosed that they weren't necessary, you will be running a losing battle!
I think that the best thing is to say as little as possible - it is well known that it is an airborne virus and how it is spread - your son is a grown adult and able to make his own decisions, whatever you believe.
If and when you two meet up over Christmas, just continue to wear your mask(s) and if the grandchildren ask why, just simply explain that it is because you feel either safer or more comfortable to do so. If they then ask why daddy isn't wearing one, he can explain his own theory!
I'm a bit stuck! What would you do?


