All families are different, but there is a distinct trend of dads letting kids get away with minor misbehavior as long as they don't tell their moms.
A recent Reddit thread asked people to recall the times their dads let them get away with something and added the dad mantra: "don't tell your mother."
One night when I was about 8, after I had gone to bed, my Dad was playing a Nintendo game, Legend of Zelda I think. We had both been playing it but we were stuck. He finally found a secret passage, paused the game, and came upstairs to wake me up. He told me he figured out where we were stuck, "snuck" me downstairs in a blanket (I'm sure my mom knew), and I got to stay up after midnight on a school night, hiding under a blanket, to see where the hidden passage went. It was a silly little incident, but very memorable. - Strongdar