Nanny, your husband is being a totally selfish person. People like him spread the virus. I would not want to be round him and risk anything happening to yourself. I don’t think I would want to stay married to him, but that’s just me, I would lose all respect for him I’m afraid.
Your son, let him do what he wants, his decision, see him in a few years if that’s what he wants, but I would explain that you have totally opposite views and you are doing what you think is right, Ring your son if you must, you don’t want a permanent rift, just kindly say how it is and sorry it’s going to be a long time before you can safely meet up. Leave it at that.
I so sorry you are in this position, thank goodness your daughter and your gd bring joy into your life and you have helped her through a very traumatic time,?