I agree that you should try to get these kittens into human hands as fast as possible. You may have a problem with mom if she is feral, try borrowing a humane trap from an animal control group in your area. If you can't catch mom, take the kittens anyway, even if they aren't weaned. You can buy formula and the tools for feeding the kittens at any good pet store. Time is of the essence for these kitties, the sooner you get them, the better off they'll be. If you allow them to mature without human contact, it will be hard (if not impossible) to tame them. I speak from experience. One of my cats had a kitten outside, I didn't know about it, and by the time I did she was unapproacable. I now had a feral cat living on my property, she would eat the food I left outside, but I was never able to touch her. She abandoned her first litter as soon as they were born, her mother adopted them at first, but then her own kittens were born and she abandoned them too. Now I was trying to raise four very small kittens who had been abandoned twice. One of them made it, she is a very sassy 13 year old cat today. Over the years, I have intercepted a number of her litters, raised them myself, and without exception, they have all made wonderful pets, including the two eight year old brothers Mr. Underfoot and Pixel I also kept. I found good homes for the others.