I took them to the vet today. Mama got all her shots, and kitten got the shots he can have (he's probably about seven weeks old, and they can't quite determine if it's a he or a she yet, so for now I'll refer to it as a he). They also got a deworming shot, a nail trim, and flea treatments. Overall, they're very healthy, and with a little food they should be perfectly all right. They are adapting well to life indoors. I've been keeping them cooped up in the game room to minimize my other animals' exposure to fleas and other parasites, but I'll let them out into the rest of the house pretty soon.