Okay,
I'm afraid you have a lot of work ahead of you. Read this stickie for the reasons
https://www.askmehelpdesk.com/pest-c...pt-386490.html
But what you need to do is
1. Get the animals on a program for flea control, be that bathing, spot on products, sprays, dusts, whatever. They have to STAY on it.
2. Evacuate the house for an afternoon (4 hours). As you leave, apply a flea control product with both an insecticide and a growth regulator in it.
3. Immediately vacuum the house on your return. Make certain fleas cannot survive in the vacuum bag, either by changing it or sucking some flea powder into it.
4. Here's the trick you've been missing: vacuum the house
EVERY DAY for 2 - 3 weeks. I mean the WHOLE house, under the beds, under the pet's beds, everywhere.
5. Wood floors, tile, and linoleum need to have a flea powder treatment, sprinkle flea powder on the floor and make sure it's completely covered by spreading it with a dry dust mop.
6. The lawns need to be kept as short as possible so the natural predators outside have a better chance to kill as many larvae as possible.
I said it would be a lot of work, but consistency pays off.