In answer to the question in the OP--my daughter and son-in-law
I think my daughter is following her husband's lead, which is surprising, because she's usually very independent-minded, but he is a bit of a rebel in general, and he is not doing it because of skepticism and paranoia, and my daughter, for some reason, is following his lead.
So it has impacted the family in that my son and DIL refuse to be with them during family gatherings (rightfully so) because they have two small children, unvaccinated. In less than 2 weeks, my NJ son will be coming up for vacation, and we'll all be together at multiple occasions, and it's going to exclude my daughter from many of these activities.
Such a shame. Not sure she realizes the position she's putting the whole family in, but today's the day I'm going to lay it on the line (DH has repeatedly told her to get vaccinated in text messages). I know she would bend, but I wonder if she would now put the shoe on the other foot and be able to influence her husband.