The health and happiness is the most important thing regarding an older person. This could possibly be a farther. Talking to him and reassuring him is the best approach. Ask what he needs and you will have a starting point to Help him.
There may be interference from others and their views may be the opposite to yours. Rifts with them may occur and you may end up feeling unsupported by them.
Please stand firm because your the one who wants the best for him. They may not, they just want an easy fix to the situation.
Harmony will be restored and the others will eventually see your side and that you were correct in your approach. xx