So we get our step kids every other weekend Friday through Sunday. The past couple of weekends we got them my stepsons head has been shaved and my step daughters head full of lice. We treat her hair , comb all weekend , and everything down to the t. Our problem is she not getting her hair combed and treated again 7-10 days later , and the house not being treated. What is the best way to go about this situation. Head lice can and will get extremely expensive. Help !!