If the mother has rejected them, and it sounds as though she has, you can either attempt to raise them yourself or take them to a vet or shelter who will. They will need feeding every couple of hours with kitten milk given in a syringe, dropper or bottle with a teat that fits in their mouths. This is day and night, so it wont be easy. Its likely that they wont survive. Once you've taken over their care you will have to keep them away from the mother.

 Ouch! Looks like the mommy doesn't want her kittens :[ Don't worry! I'm pretty certain that places sell milk for infant kittens. So you might want to buy some. Or first visit the vet. It looks like one kitten didn't survive that quickly, so you should visit a person who has good supplies for cats and an expert, if you don't know one, find a local vet I'm sure they'll be able to help on time. Best of luck to you =]