This is my body - Lindsay King-Miller

A gripping, emotional, and darkly funny queer horror novel about family trauma and possession, for fans of Rachel Harrison and Catriona Ward.
Single gay mom Brigid always thought that cutting ties with her extremist Catholic family was the best thing she could have done for her daughter, Dylan-and for herself. But when Dylan starts having terrifying fits of unnatural violence, Brigid can't shake her memories of a girl from her childhood who behaved the same way . . . until Brigid's uncle, Father Angus, performed an exorcism.
Convinced that her daughter is suffering from demonic possession, Brigid does the thing she told herself she'd never do: she goes home. Father Angus is the worst person she knows, but he's also the only person who can help her daughter.
But as Brigid starts to uncover secrets about Father Angus, that long-ago exorcism, and her family's past, she realizes that she and Dylan have never been in more danger.
This Is My Body is a piercing journey into religious trauma and childhood shame, building towards a heart-pounding twisty climax that will spin your head all the way around.