Realizing all the potential of the Journal of Facts, and quite jealous of the preferential treatment given to Tina, he write "I am Tina, clearly the favorite child and, as of today, the 15year daughter of Margaret and Steven McCoy."
Then, fearing it might turn him, or rather her, as spoiled as the original Tina was, she hastily added "But somehow, it didn't turn me into a spoiled brat. In fact, being always nice and helpful to everyone unless they warranted otherwise, anyone knowing me can't help but appreciate me."
Nadia/Noah felt her vision swirl and her body change, being a bit sick for an instant. When her vision cleared, she was on Tina's bed, in a room bigger than even her parent's one and with an adjoined, private bathroom and a walk-in closet.
Looking in Tina's mirror, she saw a rather cute, if a bit young to his tastes, girl with ginger hairs, freckles and green eyes. Said eyes widened when realization hit their owner. "I… I am Tina !"
The new Tina then wondered why she was in her room rather than downstairs, which made a previously inexistent memory filter into her mind. The always helpful Tina wanted to help her mother prepare the party, which Ms. McCoy couldn't accept from the guest of honor, and was forced to ask her favorite child to go to her room.
As the memory ended, Tina was finally called downstairs for the party, preventing her from wondering where said memory came from, or how she had it. It also caused her to forget the Journal of Facts for the time being.