I'm a 50 yr old dad of a 14 yr old son & if he ever smoked pot in the house, I'd tell him to take it to the garage, as I do. No smoking anything in the house. Always bongs. I still got my Toker 2 that I bought in 1974 & it really does the trick.
Level with your old man. He must've smoked when he was younger...I just forgot to stop.