Each of the teenage girls had been a mother of someone he knew. He recognized Zelda's former mother, Gillian, from seeing her come to the house with his current ex-girlfriend. She was talking to a young version of Lauren O'Brien's mom, just recognize able with her hair still red.
The last girl was the most shocking though. Jon turned to look at his "mom" then back at the girl. It was crazy to see Sarah's original mother, Susan, younger than the woman who had been her daughter.
Why did the stone swap all of these mothers? Didn't he wish for girls at his school to change? Jon still couldn't figure out that his poor foresight with his wish had led to this situation.
Sarah noticed Jon checking out the trio. "See Jon, those are the type of girls you should be pursuing." She said, mistaking why her son was staring. She was happy to see him starting to put Zelda behind him, and scope out other girls. He just needed a push. "Why don't you go talk to them? The blonde one looks perfect for you."