"What if the King adopts Siffrin-" "NO what if Bonnie and Nille adopt him-" "Wait what if Odile adopts them-" WELL WHAT ABOUT EUPHRASIE ADOPTING SIFFRIN.
Housemaiden Euphrasie finds a dark haired teen with nothing more than the clothes on his back, a shitty dagger in hand, and a handful of Vaugardian and Porterian phrases under their belt. She hears their accent, sees those metal pins, knows that darkless hair far too similar to her own and decides. This child should be protected.
So she gives him a place to stay, among her fellow housepeople at the House of Change in Dormont.
And Siffrin grows up there. He visits the Observatory with her, studies that eternally locked door, takes a few classes and learns about the Change God. He clings to her when there's too many people in the cafeteria or when that one new scientist girl starts flirting with """Euphie""". Siffrin reads so many manuscripts of plays, takes classes to learn other languages and acting courses to occupy time and maybe sometimes he visits other cities to explore other Houses (with Euphrasie, ofc). He can help her see who wished for Vaugarde to be saved, and run away faster than anyone and escape the House when the King arrives. And later he can stumble on that study-all girl, rumored to be blessed by the Change God (how strange!) after helping her growing party defeat a particularly large sadness. Then he can see Euphrasie and panic when she starts to speak nonsense, saying something is broken, failing, rotting, and realize that Vaugarde's intent, as pure as it was, has trapped him in time. And then he can cry when he "shoves" (threw like a broken doll) her and apologize and she can just hug him and promise them that its ok!!!! Its all over, its all ok, and she's more than happy to bless them on his new journey.
And Euphrasie!! She cares for Siffrin almost like her own child. He has a family, somewhere, but until they can be reunited... she can be a guardian. She can play favorites just a little when she's nominated and accepts the position of Head Housemaiden (she pretends not to see Siffrin cry with pride). She can teach him, and try to bury the past under the changing future with them. She can tell him about the wishes, and they can wish for a savior from the King together. She can cry and hope that Siffrin escaped, or that Mirabelle was able to save him with her blessing. She can see the broken, rotting, failing wish and Siffrin with tired eyes and an exhaustion deep in his bones, and know that their past- even just a little- has caught up and it has ruined them. She can see the haze of something familiar take over her and wake up to a viscous shade still in the sky, coming from... Siffrin? She only gets a glimpse, though, before she's out like a light and waking up to overhearing Siffrin talk with his party about continuing to travel. She can heal herself as as much as she wants to hold them close again... they deserve to explore the world with a new family. So when she blesses them, she asks they never forget her and the promise to come back and write letters and they whisper "I love you" before parting ways.
So yeah, Euphrasie adopts siffrin