Flea bites on humans - use tea tree ointment or a bog-standard antihistamine cream.
On the dogs, tea tree again - great stuff!
Do you have cats? I'm told fleas don't actually breed on dogs, just jump on for a feed then jump off again - it's the cats that they live on.
So if you have, you need to do them too.
Have you treated your house? You need a good vetinarian strength flea spray to do the house.
Also, what stuff are you using on the dog? Is it Frontline? That's the only brand I've found to be any good (its the one you put on the banck in between the shoulder blades)
But - the cycles of a flea is approx 4 weeks. So to be completely clear in the house, you really need to treat all animals monthly for 6 months and the house every other month.
Sounds grim doesn't it? I have awful problems with them
Good luck!