Devolve their minds too.
Quicker then he could react, Amber takes the mobile phone from Danny's hand, startling him. "Hey, give that back" he says. The two cavegirls starts to touch random buttons of the app, grunting happily all the while. Suddenly, they throw it on the ground, smashing it to pieces.
"What you've done?!" screams Lacy, filled with despair "Now we'll be stuck as hairy cavepeople forever..." Stopping that train of thought as she press her hands on the sides of her head, appearing to be in pain.
"Mom, what's going on?" Then he too put his hands on the pain, feeling an intense pain. And he realize that his memories were fading, making place for new neanderthal memories. "No.no,no" He repeats as he is rapidly becoming dumber.
After a few more moments he stops, a vacantly gaze in his eyes, joining his sisters into being a caveman. The three of them turns to the last person in the room, waiting for Lacy to finish the process. "No, i wll not be a cavewoman" she says defiantly, trying in vain to retain her memories. "Me am Lacy, me smart person, wait, it no right, me am not talk like this" saying with fear as she lost the ability to formulate complex speeching.
And after some minutes of struggling, her mind vanishes completely, leaving Lacy Horton as a cavewoman, in body and mind.