Start with high-confidence ya sibling stories books, then narrow by subgenre or adjacent topics.
Missing Sisters
Gregory Maguire
Thirteen Doorways, Wolves Behind Them All
Laura Ruby
Far From the Tree
Robin Benway, Sophie Lamotte d'Argy
Girl Unbroken
Regina Calcaterra, Rosie Maloney
Invisible Ghosts
Robyn Schneider
A Constellation of Roses
Miranda Asebedo
If Only I Could Tell You
Hannah Beckerman
Disappearing Act
Jiordan Castle
The Alternatives
Caoilinn Hughes
And the River Drags Her Down
Jihyun Yun
Vaulting Through Time
Nancy McCabe
If You Find Me
Emily Murdoch, Tai Sammons
Stick
Andrew Smith
Sisters in the Wind
Angeline Boulley
US Without You
Vicky Skinner
Homecoming
Cynthia Voigt
Out of Reach
Carrie Arcos
Thicker Than Water
Natasha Deen
The Flowers in the Attic Saga (boxed Set)
V.C. Andrews
In the Woods
Robin Stevenson
The Last Letter
Rebecca Yarros
Catastrophe Theory
Rebecca Lowry Warchut
Family of Liars: Deluxe Edition
E. Lockhart
The Devil's Daughter
Danielle Steel
