Just use conditioner and this comb u can buy from the chemist call "nit free", costs about $15 but worth it.
Do your hair and your daughters with these and do both ur hair several days in a row, by about day 3 u should have got most of them, then leave it a few days and do it again.
This way u dont have to expose either of u to chemicals.
Wash/change pillowcases and sheets each time u have done ur hair.