Well, last week I was 90% certain we didn't have lice in our house anymore, if we ever did, and now I'm 99% certain. Now its just a matter of getting mom to accept it and mom and grandma to treat easy child 2 so she really does get rid of them...
Mom would never go for it, but this 2-house kinda thing could really be used to her advantage to get rid of these things. Now that we're sure our house is free, we could treat easy child 2 and keep her with us for several days, while mom and grandma did the same.
(But that hot place down south will freeze over solid before that ever happens.)
I just hope we don't have to do all this again.
Thanks for all the suggestions and help. I've definitely learned a lot.