This was nice! I tried with my five year old using nuts and bolts as chips. They got it right away and we quickly upgraded to two cards. The three year old also wanted to join but they had no idea what they were doing. (Cargo culting the motions with no correlation to hand strength.)

Come to think of it, we also did not ante but used blinds instead. That way I could put him in the small blind and open up by asking "do you think your card is higher than mine? if so you need to call the current bet of 2."