Congratulations! Do you plan to keep all of them or are you seeing to the neutering out of the goodness of your hearts? Are you going to get the mother snipped as well? This will depend on whether she can be separated from her children, of course. If they're still hanging around with her, they must be very young.
Lucky you to get to revel in kittenry. I could use a dose of 'em myself--sans the attendant responsibilities, however.