I feel your pain, been through it myself with my step-sons. My hubby, his ex and their kids dealt with it often. After I moved in, we dealt with it several times (like after the boys visited their Mother's house...grrrr). During the process of redecorating the house, I yanked out all the old wall-to-wall carpet, replaced the carpet in the basement and left the entire upstairs carpetless. We have hardwood and vinyl throughout with a throw rug in the living room and have been lice free for 4-5 years...woohoo. Of course, I still cringe if I see anyone scratch their head while in my house, which I'm sure you understand. Hope you've gotten it nipped for good this time.