Fai's really just a young 20-something sheltered rich kid on a search to find himself, and he put a sleep spell on his father while his father was already asleep so that Ashura wouldn't know he went dimension hopping without Ashura's permission. Chi? His little sister who'd do anything for him, including transforming into a pool blanket. No biggie. Trust me, I'm a professional. Don't bother reading his backstory chapters, this definitely is it, and all that happened. Definitely.
SOUNDS LEGIT TO ME.
I see no flaws in this whatsoever.