My now 16 yo grandson has been in my custody since he was a baby. It has always been no phone, no tv, no hat on at dinner. He also knows to address all adults with yes mam, no mam, hold doors for all ladies, no foul language, always tell me where is going and with whom. I instilled this in him from when he was very young, very consistent, no exceptions. He follows all this now as his norm, times I have to say anything is almost nonexistent. He is very into school activities and sports, every time I am at a game or event another parent, grandparent, or teacher tells me what a great young man his is.