How old are the kids now Donna? It's very normal for kittens to eat litter (annoying, but normal). Be sure it's a kitten safe litter. Sweet-Scoop is a wheat based clumping litter which is great for little ones, and is harmless if they eat it. regular clumping litter can be dangerous. It sounds as though they may be ready to try it out. And if you put food out for Mattie Grace (wet) if the kittens are ready, they'll nibble along with her. Generally 5-6 weeks they should be using the potty.