I overheard my 17 year old cousin speak of using weed but I don't know much about his usage. My cousin currently lives with his father who I am unsure would care. I don't see his father but I see his grandparents who are my aunt and uncle. I am unsure if speaking my aunt on this would do a thing as I don't know how much about his situation. As of now I plan on holding off and asking a priest for his opinion.