"Okay," said Jane. "Here's the plan."
Jessie and Karyn listened.
"First of all, I add something saying I can reverse this whenever I want to. No sense in making a mistake I can't fix."
"Gotcha," said Jessie.
"Then, I wish that I'm a teenage girl and that Jessie is someone else. The best thing to do would be for Jessie to become my brother, but I can't do that, because of the whole 'one son' thing. It's the same reason I can't become a guy myself.
"I have an idea, Mom," said Jessie.
"What is it?" replied Jane.
"You turn Mikey into a girl. That way I can still be a boy, and there's only one."
"Hmm. I guess that would work. Okay, change that. I have to wish that I'm a teenage girl, Jessie is my brother, and my younger brother Mikey is my younger sister Marie. Jessie, you don't want me to wipe your memory. I don't understand it, since your memory right now isn't real either, but if you don't want me to wipe it, I won't. But you'll have to have at least a little bit of new memory just so you can get along without looking silly."
"Sure, Mom," said Jane's son.
"I wish that this all happened, including the part about being reversible."
Miraculously, Jane was now her original age as Jon. Karyn was still there, and Jane's son... in this reality he was her brother, but he still remembered a whole life as her son. "Weird, Mom. You look so young...."
"I was always this young," said Jane. "Even your original memories are just from a wish."
Jane went out into the hall and glanced into the living room. Her brother wasn't there, but there was a girl who looked a lot like him. So it seemed to have worked....