The Momma cat needs to be trapped, spayed and released. There must be rescues in your area that do TNR. They may also take the kittens. It's better to get them young and socialize them - better chance of them getting adopted. The major pet sotres usually have adoption places that they work with doing adoptions on the weekends. They might have the contact.
You're right, though. You're going to have a feral cat colony in no time if something isn't done quickly.
Meanwhile, it sounds like you have a dilute tortie on your hands. She more than likely hasn't had any shots, so be careful exposing your kitty to her until she has at least one set. I wish you were closer, I give vaccinations.
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