Ahh, what a classic. Just a simple story about good behaviour = rewarding, with some fun rhyming. When I was tiny, I felt so sad when the kittens got in trouble for losing their mittens. They had those strings on 'em and everything! The mom cat seemed a little cross, but she probably put in some good knitting time. Spoiler alert!
The kittens get their mittens back, and mom bakes them some pie!