Hello and congratulations on your son's return home from transplant. I am a liver/kidney transplant recipient. I am 5+ years out now. I wore my face mask religiously around people and when I was out of the house for almost 2 years. It is very important, although, very uncomfortable. Safety first is my preference. Hand washing is important along with hand sanitizer. I would recommend isolation for the sick one in the household if possible. Other than that just pray it all works out. It is a tough journey to walk and you can only do the best you can do and not beat yourself up as a caregiver. Caregiving is a tough job and, at times, not appreciated. You have to learn to go with the flow of the day and make the best of a bad situation and not feel guilty if you have to take a break and take time for yourself. I encouraged my husband to go out for a while as I recovered so he could have time away from me as well as I from him. Good luck and will be praying for a healing for your son and grandchild.
CK