Jon's grandfather would never have sent such a powerful item as the stone to someone as untrustworthy as his two Goth grandchildren. So, in this new reality, he instead sent the wishing stone to his daughter, who was Jon and Zoe's mother.
She took the stone out of its box and looked at it. She had already tried it out and discovered that her father was telling the truth, as bizarre as it sounded. It really was a wishing stone. But she had spent the last few days putting together a list of things to wish for. And now she was ready.