Time is on your side.
Nit-picking is the most effective way to get rid of your head-lice problem. So, why are people so reluctant to do it? You might think that a lot of people are really grossed out by the bugs. But, for most people, that's not the issue. They don't want to get down to the business of nit-picking because they feel "they just don't have the time".
Yes, nitpicking takes time. It can an hour or two, or even longer if you do it all at once. But if you think that there is any treatment that can speed up the process for you, then you are very mistaken. The "shampoos" will not kill all the bugs and will not kill the eggs. You will have to use more time and more money dealing with the problem again in a matter of days. And, as you know if you have ever used the so-called treatments, their instructions state that you still have to pick out all eggs and bugs. So, you see, absolutely no time is saved by using a commercial treatment.
The good news is, you don't have to have a 5 hour marathon nit-picking session that causes your hands to cramp up and your eyes to blur. An adult louse only lays 3-10 eggs in a day - that may seem like a lot, but you can pick faster than that. So, if you can't deal with your family member's head lice problem in one or two longer sittings, here's what I suggest. Pick for as long as you can over a number of days. Even 15 minutes here and 20 minutes there every day will get you ahead of the game. Your priority is to pick out any bugs that you see. Then grab the eggs as you can. A real lice comb will speed things up even more. Be sure to keep things relatively clean , take basic precautions so that other people in the house don't also get head lice, and do regular quick head checks on everybody and you will be fine. If you keep doing this, then there will come a day very soon when you will no longer see any bugs or eggs.
You can call me for more free info. And if you want to have me come over to pick, I will gladly take your money. But it probably isn't necessary. You can always find the time to deal with this. Just do it.