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The kittens were probably alive when the mother cat brought them to your door.

They were still warm. If only I had gone out sooner....

You did the only thing you could do. Thank you for looking out for God's creatures.I wish we could have helped them..

[B-Chan]

It's too late to help these kittens, unfortunately, but you CAN help the mother -- by having her spayed. A no-hurt trap is very cheap; just buy one, bait it with a Treat (cold cuts or tuna work great), and be patient. You'll probably catch a few other critters in the process (if possums, release 'em, they're beneficial and harmless; if raccoons -- call Animal Control, they can carry rabies), but keep baiting it until you catch Mother Cat. Then take her, trap and all, to your city shelter or SPCA.

It's not too expensive to have a cat fixed. The best part is that no more kittens will be born, and, in many cities, if Mother Cat gets picked up by Animal Control in the future, they won't kill her once they realize she's sterile.