Ihad it heaps growing up. It was before natural remedies, and the chemical remedy made me faint. So by the time I was nine, mum was all over it.

* Keep their hair in plaits as much as possible. Lice can't then climb up the hair to get to the scalp and lay eggs
* See if you can't lay your hands on a tea tree shampoo. Mum used to wash our hair with this every Sunday night, regardless of whether or not there was an outbreak.
* Vinegar or conditioner makes the hair shaft slippery, so again, hard for them to climb. Spray in and leave it in after washing.
* Fine tooth comb removes the actual eggs. Takes forever, but has the added benefit of stimulating hari's natural oil production, making it harder for lice to climb the hair shaft.
* Wash all hats and bed linen at the same time as you treat. Doesn't hurt to do the odd couch cover as well. Officially, this has no effect on transmission of nits. Anecdotally, I'm sure it makes a difference.

Good luck! I hope they crawl on out of your place once you wage this war!