"My mom's a fucking bitch and my brother is a fucking twerp," Sarah continued to complain. "You have no idea how much of a nuisance my brother is. Just last week ..."
"I have a brother too, you know," Jon said.
"What?"
"I have a brother. I know how annoying it can be."
"Jon, you're an only-child," Sarah said.
Jon blinked, then said "Oh yeah. I ... I'm not sure why I said that." He grabbed his forehead. "It's so strange. It was like the feeling that I had to come here, to your house."
"Are you sure you're okay?" Sarah asked.
"Yeah. Yeah, I'm fine." Jon smoothed out his tattered dress as much as possible, then smiled at his friend.
Having heard enough, Mikey went back to his bedroom to get the stone and some answers.
"I wish to know who Sarah is," he said, holding the stone. The stone grew warm in his hand and he received his answer. The stone told him she was his sister. He looked oddly at the stone. Why did it tell him that? Zoe was his sister, not this Sarah girl.
"I wish to know where Zoe went," he said. The stone told him that Zoe didn't go anywhere, that she was still at home. "But she's not at home," he told the stone, as if it could hear him. "What's wrong with this thing?"
What Mikey didn't realize was that reality was constantly changing itself every time someone took over someone else's life. So, the stone was only answering Mikey's wishes according how things were in the current reality. And in the current reality, Sarah had always been his sister and Zoe was captain of the football team and lover to the head of the cheerleaders, who was now Athena McMillan.
Mikey was thinking of just ending his "clothing" wish (he gave himself an "out" in the original wish), but he decided that he wanted to investigate what was happening first. The stone obviously was no help, so he decided to do it on his own.