My suggestion is that you get the following supplies: a real metal nit comb, a ketchup bottle, cetaphil (tm or generic), a hair dryer, a bonnet attachment (optional) and a dryer that has a high heat setting.
1. Comb hair and apply a lot of cetaphil to everyone’s heads. Follow the directions on the link carefully.
2. Use the bonnet to bake the cetaphil on without making yourself crazy. Stick child in front of electronic device while everything dries/heats up.
3. The directions above say you don’t need to use a nit comb, but I did, and I don’t regret it. Consumer reports says this is really the only part that helps. I’m ok with redundancy.
4. Dry anything you’re worried about being contaminated on high in a clothes dryer for 15 minutes. But, don’t worry too much.
I believe that the head lice in our Eugene schools are resistant to the over the counter pesticide shampoos that were available a year or so ago. [See point 5 in the summary of key points.] The suffocating treatment detailed above isn’t FDA approved, but worked for us with the nit comb and the clothes dryer. Your milage may vary. In addition, there are some new products to try, if you’d rather.
Also the 2010 American Academy of Pediatrics’ policy statement with some interesting bits of information: http://pediatrics.aappublications.org/content/126/2/392.full?sid=10e25e1b-8146-470b-8c0a-3c3cc16460ec
Good luck!