The only thing I would add to the excellent advice you've already received is that you spend some time each day, minimum morning and evening, picking up and handling the kittens one at a time, and at the same time making a fuss over momacat and petting her too. Too many people have the wrong idea that young kittens shouldn't be picked up at all. This will go a long to way getting the kitties well socialized to human contact. Handle their paws, and ears gently and caress them with your fingers as a momacat would do by licking. This will make the kitty easier to handle when it comes time to clip their claws or be handled by a vet or be groomed.