I haven't been at this very long... I think it's like taking a child to the doc office to get their shots... No is not an option for them. But it's easier... You can pick them up and the law supports you.
I like 2 statements I began using...
"At least you can pretend"... (You like me)
"Because you are my father and I love you."
(Equivalent to "because I told you so" to a child)
Any other statements you find helpful that I could add to my list?