I had a friend way back in the day, outta touch now. When she was little, she would go play at a girlfriend's house. The friend's dad was a drug-dealer. Nothing bad ever happened, though the girlfriend moved away suddenly one day, without giving any warning. Before that happened, they would find the father's briefcases full of bound wads of cash, too young to really understand, they made houses of it for their dolls.
They never got in trouble for it.