A texas breeder of standard poodles told me this years ago when I was prepping show dogs for her. Use Zest soap for bathing for the kids and yourselves. I have no clue why the heck it works but it repels and kills fleas. I have experimented with it when I was doing rescue and had flea ridden rescue dogs and in a pinch when nothing else was available it did kill fleas on small short coated dogs when they were lathered with it. I DO NOT REPEAT DO NOT recommend this for use on dogs its an emergency thing only but it does work well on the kids and is completely safe for them. Hope that helps alleviate your husbands worries regarding fleas on the kids and once you implement the other suggestions for the chicks you should be in the clear. Best wishes and hope this resolves things for you quickly