Stay away from them. They're going to have health problems (everyone does, getting sick is normal) but they have pre-loaded the narrative that you are to blame. All you have to do to be blamed is be there. Vaxxed, masked, triple jabbed, it won't matter. Ironically there is evidence already available none of those things prevent illness and health problems, so when the time comes to assign you the blame your obedience to their precautions won't spare you their blame anyway.

Tell them you love them, but given that they perceive a risk it would be better not to risk it at all if they have reservations about her health right now. The masks aren't effective anyway and evidence shows the vaccinated are still at risk of spreading infection and being infected. You want to see them, but not if you are risking her health to do so.

When they're covered in shit and piss and getting 1 hour of sleep a night the value of family will be greater than the value of their virtue signalling. Their principles will remain intact if they get everyone else to pay the cost of those principles and pay nothing for themselves. Let them pay the cost themselves and see how long before they red pill themselves for self-interest alone.