Sounds to me like it's time to call in the experts. Get the house sprayed by a reputable person who uses a flea-icide that's been tested for safety. Meanwhile, take the pets to the vet for treatment.

Fleas lay their eggs in dark cracks. I don't believe you can vacuum every dark place that a flea egg could be in. How far can a vacuum reach into the space behind a baseboard or inside a couch?

Standard advice is to wash all bedding in hot water. How many blankets/bedspreads are there in today's world that would survive that?