Try placing a killable children mod at the bottom of the load order. If that doesn't work. Then try opening the mod in GECK and removing essential flag. I never tried it on children but I'm assuming that you can remove the essential flag for children like you can for the adult NPCs...
A problem with this and all your other Child mods is that the Children are unkillable. In the Pitt, for example, once the rebellion starts, these invincible children eventually end up killing all the Pitt Slavers.
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Even with any of the kill child mods
EDIT: I was totally wrong, they aren't killable. I was going to use console to kill them but I'd rather just get rid of the mod
But this one is still a beta ;-)
anyway great mod ^^