It's really sad that people must risk the health of their own family to help others. I'm so thankful they do, but the sacrifice is real. Hopefully her son and husband remain well. I always comfort myself saying my nurse daughter in law has a little more knowledge than most about preventing an illness to spread through their family when one of them is sick. Covid has put a kink in that since it is respiratory, but she is still more aware and that comforts me. My son was sick recently, and during a video call the curtains, and even the kids' hair was being blown by the wind. A typhoon was bringing high winds through Tokyo and she took advantage of those winds, opening all of their doors and windows. They are on the 8th floor so the winds were quite dramatic. A little bit of old time thinking, but it couldn't hurt. I'm sure your neighbor is doing everything in her power to protect her family too, even if it is to just hide in the bedroom. Remember to be cautious in shared areas such as elevators, since its likely that her son and husband have to go out at some point, maybe for a grocery trip, work or school.