"Why am I in ... the guest room? I ... live here," Jon said.
Other-Zoe shook her head. "No, Jon. You don't live here. This isn't really your house, remember?"
"What?" Now Jon was even more confused than before.
"It's a movie set," Other-Zoe said. Then, seeing that Jon wasn't getting it, she said "It's a movie about your life, with a few fantasy elements thrown in to make things interesting." She smiled, in a very non-Zoe way. "I can't tell you how lucky I feel to get the part of Zoe."
That's why Zoe looked the way she did. It's because she was an actress playing his sister. But who was playing Jon? And what exactly were these "fantasy elements" that this girl was talking about? Jon wondered if maybe she was talking about the wishing stone. But the stone was real, right?