Meanwhile at the mall, Jon and Karyn were eating in the food court, talking about all the things they could do with the wishing stone. But a few minutes into their meal, Jon disappeared and no one noticed.
Now, Karyn was by herself, eating by herself. She had no memory of Jon or Jon's family.
Jon can't have a mother that is younger than him, so as part of his mom's wish, the stone erased Jon from existence, along with his sister Zoe and his little brother Mikey.