#he probably had fun speculating how gobsmacked Ray looked at their family pulling the rug out from under him and proving him wrong tho lol

[fullscoreshenanigans]

When we think Sarah has even changed Ray's birthday date to avoid Isabella to suspect he's her son, it's wild. I mean it's valid, she WOULD have been suspicious if Sarah had given her a baby who shared her own baby's birthday. Like she would probably suspected it immediatly. (I also bet that Sarah waited Ray's shippement day to told at Isabella's face "ho by the way, it was your son that you just see die" just to hurt her/break her) Have you a headcanon of what could be his real date?

This might be a better question for someone big on astrology because the specific date is immaterial to me, much like it appears to be for Shirai.

(Mystic Code Book Chapter 2)

What matters is the aforementioned deception by those in power for Isabella, a reminder how despite the position she secured for herself she was still the demons' pawn, and how it's one more thing denied to Ray by the overarching farm system and potentially his mother. If he asked her about it, it was one more concession he made to her, another reinforcement of the power she held over him, and assuming all the other birthdays provided to us are true, it's one more thing to separate him from his siblings.

It might bother him while he's suffocating under the oppressive aura of the house, but post-escape, he's able to embrace the false birthday designated by headquarters in earnest, completely divorcing it from all earlier ill feelings.

I imagine in the future if they ever find out his true birthday and they asked him if he'd like to change the day they celebrate it, he'd turn down the idea, citing it as the day he and fourteen other members of his family experienced their first morning of freedom.