They are living in your carpet.....
They are not living on you persea but are biting looking for a new host now that your cats are no longer there. They will all die within time...
I am sure you still want to remove them anyways since the thought of children and all of those dead flease is kinda gross!
Anyways...........Here is what I would do if I were you.
This will take teamwork for you and your husband.....a friend or neighbor too if you could find someone to babysit for you.
1) Sprinkle Borax on your carpet as if it were that carpet fresh stuff.
In every room that has carpet and behind the beds.
Yup, I said Borax it kills fleas You need to let it set on the carpet for no less than an hour...since you no longer have pets. That should be long enough. Do you have a really good
vacuum cleaner? Use a new vacuum bag so that you get the strongest suction. I would only do this if I had a very good vacuum cleaner or access to one.
2) I would wash all the bedding....and any place that kitties frequently took their naps. Vacuum under couch cushions too.
3) After all of that work is done...I would set of a few flea bombs.
Depending onhow large your home is....then leave the home as according to the directions on the flea bombs.
4) Then when I get home I would vacuum all over again.