Care-recipients need to feel in control of their lives. "Asking" is the key. Providing someone the ability to say "no" and then asking again later is key to delivering? that control and works wonders. I have years of experience I can share if it will help.
Getting children to take their medications, do exercises, etc that they don't want to do is a challenge. I have become the master of bribes, compromise and learning when to just insist when I am faced with