Difference of opinion in care

It is often hard to convey to my siblings some of the things that I have learned over the course of the years I have been a full-time caregiver. Things such as that our dad has to walk a certain amount or he will get blood clots in his legs, that he needs to step up the steps into the house every once in a while or he will not be able to do it. I know they just want to make him comfortable and do things that make life easy for him, but I want to do things right so that he stays healthy for years to come.