My ds and family rented a house that has fleas. They've flea "bombed" it 3 times within a week and a half, and they STILL have fleas. Their poor cat which didn't have fleas when they moved there, has been flea treated with mousse, and bathed way more than a cat ought to have to put up with. DS & DDIL have 3 very small children, so have to leave the house for the entire day every time they bomb it. This is getting old, and $40 later they STILL have fleas. Can you tell us how to get rid of them once and for all? Help, please!!!!