I would definitely try to get the kittens out and bring the family inside.
1. The mother can quickly get pregnant again, and it would be best if she got spayed when the kits are 8 weeks or so. Until that can happen, keep her indoors only.
2. A male cat could kill the kittens in order to get the mama to go into heat.
3. There are predators (raccoons, stray dogs) who could get to the kittens, or the mom, then leaving you with orphans to try to raise.
4. If the kittens aren't around people, they won't get socialized and house broken. This will make it more difficult to adopt them out in a world where there are far more kittens than good homes.
You may be able to contact a rescue organization to help you get the kittens out. They may also be able to take mom and babies if you aren't able to. Maybe you could even foster the family until they are ready to go to new homes. That's so much better for socialization than staying in a shelter. Also, shelters have to put a lot of cats to sleep because of overpopulation.
Thank you for taking an interest in this stray and her family. Obviously, she thought you were a friend because of the food.
Oh, and I'd give mom cat kitten food. She needs the extra calories and energy.
Originally Posted by livliv
We recently moved into this house and I have seen a pregnant cat in our backyard a few times. She seemed extremely hungry so I fed her and she had been comming for food every day. I just went outside and heard some meowing under my deck! I brought out some cat food and shook the bowl and momma cat came out (definetly not pregnant anymore) and ate some food. I'm not really sure what to do now. I can't see or reach the kittens so I have no idea if they are ok or not. Will the mom just take care of them on her own as long as I make sure she has food and water or is there a reason I should make sure to get the cats out & in the house?