I'm lucky that my mum is cool and laid back when it comes to drugs, so I can be completely honest with her. I smoke ganja take a few other drugs with her and some family friends on the weekend-aslong as I save the drugs for the weekend to do in moderation, its cool. And I don't feel inclined to take any chemicals during the week, except for the odd joint or a psychedelic on wednesdays to help break the week up a bit.

I'm probably in a minority, but you know your dad better than anyone else-he sounds quite laid back to me so it might be worth a try.