Kiddie porn. Doing illegal drugs infront of minors-if for no other reason smoke and young lungs not a good combination. Parent is in illegal drug business. Enough said. I would report him.
You can try an anonymous tip to law enforcement, use a phone not associated with you. If it's a big operation I'd call the DEA but be prepared to give somekind of detail including decriptions of the people involved and the substance along with an address-I've had to do it before.