If you do a search here on TS.com you will find a long, interesting thread of various opinions on how to rid yourself of raccoons. I think it is a year or so old.
It sounds to me like you're stuck with your unwanted guests, at least until the kits get big enough to be led away into the world by the mother. That should take a month or so. Once they vacate the premises, you'll need to install exclusionary barriers so that they won't return and repeat the process.
Whatever course of action you decide upon, do not kill the mother, the nursing kits will starve to death under your porch and the stench will not only make your porch unuseable, but the decaying animals will attract an abundance of insects and other carrion eating pests.
Patience and resolute observation sound like your best option. Good Luck.
Pepper spray. When I was a police officer years ago I received a call that some kids were playing with a raccoon in a dumpster. When I arrived the raccoon was in the bottom of an empty front loader dumpster and the kids were poking at it with a stick. I found a 8' long 2x4 that I put in the dumpster in an attempt to get the raccoon to exit the dumpster on his own. He wouldn't leave so I sprayed some pepper spray inside the dumpster and he left rather quickly. It didn't hurt him but it was funny to watch him rubbing his eyes with his paws as he ran away.
Whatever you do, don't seal up the hole with the babies in there. The mother will tear your house apart trying to get back in. Get a havahart trap, if the babies are big enough, you will catch them all and you can relocate them.
RACOON UPDATE--As usual Trapshooters.com comes through again!! i took out some boards from my deck and spread the moth balls pretty heavily inside. I placed a strobe light at an entrance hole and for two mornings I found it in the middle of the yard. yesterday morning it was still under the deck blinking like crazy, this morning same thing.I'm just hoping ,but so far it looks pretty good. Thanks again for all the input. Jim