Taming feral kittens can take a lot of time and patience. First off they need to be secluded in a bathroom where they don't have a place to run and hide. How old are the kittens? The older they are the longer and harder it is to tame. Please read this link on taming feral kittens. It could offer a lot of pointers. I too think it needs time, but done in the right way! Good luck!

http://www.alleycat.org/pdf/taming.pdf