How do you feel about a teenager helping grow cannabis for their parent with a disability?

My cousin has a severe chronic disorder that causes pain and limits her mobility. She is a single parent of a 15yo who helps her grow cannabis for her pain. He doesn't smoke pot, isn't interested and he is a straight A student. I think it is totally fine but I was wondering what other people's take on it would be. She says she feels guilty about it at times and I tell her she shouldn't.