At my school we had one student of note on topic of bringing in family as patients.
She came from a large, close family of humble means. Almost all of her patients were family member. She never had any "no show", cancellation or inability to pay problems. She also finished her requirements way early.
I was once standing by when she was going over POH instructions. She started by saying, "You remember Aunt Marge? Well you don't want to end up like her..." I had to stifle my laughter has she used poor old Aunt Marge as the negative example to encourage better oral hygiene habits.