All the kittens are using their litter boxes now. I put a mom size and kitty sized one in their holding pen thinking mom role modeling the behavior would help them catch on and go in theirs. Nope, Survival Mom refuses to use it. Happily, one of the kittens figured it out all on his own. Then very quickly, the others catching on followed suit. Now they use both boxes and are getting better about reaching it in time. Three have completely trained themselves and never go anywhere but the box. The other two sometimes can't make it to the box in time to pee but like the others they are reliable about making it to the box in time for the other. So no coaching required. Lucky me!