Vaccine fears of vulnerable family members, help

Hi all. My son who has had schitzophrenia since about 15 and is now 29, and also has drug issues, refuses to have covid vaccination. He has irrational fears about medical treatments anyway and is really fearfull. Rationalising doesn’t seem to work. Anyone else having issues with trying to get their carees to accept vaccination? How have you dealt with this? Thanks for any ideas.

Does he enjoy any large events that will be requiring a Vaccine passport from the autumn or does he like going abroad? It might be the natural consequences of not being able to do these things that persuades him; this is what ultimately persuaded my friend’s son to have it.