First buy frontline for your adult cats, it works very well. Second get flea collars for good measure, as for the kittens You can bath the kittens in warm anti-bacterial dish soap, all you need to do is drown the fleas and as you wash the little guy the fleas will make their way to his head simply pick off the few that make it there. Do not use anything to kill the fleas on the kittens as the kittens is to young, Make sure you pick up where the kitten was to try and remove the fleas from his bedding.
Once the kittens is old enough you can buy flea control, I think eight week you could place flea collars on them. Now that you have the cats under control, you can buy
Raid Flea Killer Plus Carpet & Room Spray this is a spray not a fogger, Let me tell you it works, I run a guinea pig rescue, I can have in my home at any given time any where from 7 to 50 piggies. To top it off I have 2 cats one Pit-bull and all kinds of other random animals in and out all the time, there are no fleas in my home. It is safe around animals and I have used this for about 10 years, I could not survive with out it. Last with out beging rude, because I am not trying to be may I suggest spay and or neuter,
http://www.killsbugsdead.com/i/product_rfkpar.jpg
I have posted the picture so it will be easier to find in the store, (O: