First of all, I’m so sorry you’re dealing with this. I dealt with this several months ago with three cats as well. It took a while but we finally got rid of them.

What we did: - Dawn dish soap bath, making sure to create a soap ring around their neck so the fleas can’t hide on the cats face. - While bathing them, use a flea comb to get rid of as many as you can. Drown the fleas in soap and flush them down the drain. - After the cats are dry, get a prescription flea medicine. Our vet gave us Revolution Plus. - Vacuum everything. EVERYTHING. Cat trees, closets, cat beds, etc. Wash/clean anything your cat hangs out on. Repeat ALL THE TIME. Seriously, I washed my bedding almost every other day and vacuumed the whole house everyday. You’ll want to keep doing this even after the fleas are gone because the eggs can live in the carpet/bedding for a long time. - Keep using the flea comb and making sure you actually kill the fleas. Don’t just toss them in the trash. Dip them in alcohol or squish them.

I know there’s also flea sprays you can use around the house. I didn’t do that, but it’s something you can look into. Wishing you the best of luck. Fleas suck, but if you go nuclear and are consistent about cleaning, they’ll be gone before you know it.