The background here is sad: A close friend's father-in-law is unvaccinated. He's senior, retired, I'm unsure of age, but does have some underlying conditions. The reason he's unvaccinated is because some of his middle-age kids are staunch anti-vaxxers; I'm talking loopy, top-shelf, conspiracy grade believers of all that is unbelievable, and they have selfishly threatened for lifelong turmoil in the family if the parents were ever to get vaccinated. They worry about this, and maybe being shut off from some of their grandkids, and just let it lie. The other middle-aged kids (who didn't 'do their own research') had the jabs with no issue, and they now rarely communicate with their anti-vaxxer siblings.
Something has happened with the father, and he has been admitted to hospital. The anti-vaxxer kids obviously can't visit, and so they want the vaccinated kids to deal with everything. The vaxxed kids know the father has always been on the fence about vaccination, and would rather be protected than not, so they want to try and talk him into doing it while in hospital, and then just not tell the others that it was done.