Sorry little brainworking here, since we have to wait till 2027 for s9.
I just remembered The Rookie 3x10 "Man of Honor" Tim mentioned he has a niece and she was cristanized.
Now we know Tim is an uncle. His little sister Genny has two sons Austin and Tyler, but I don't think she ever mentioned a daughter, nor she even has one. So there are two options here: Either Genny has a daughter, whos prob older than the boys and does not live with her, or she and Tim might have another sibling we don't know about.
And if so, it has to be a half from their father or mother, 'cause we know from 4x09 Tim lived only with Genny when he was a child.










