Rule of Threes by Marcy Campbell 

How do you share a parent with a stranger? Maggie’s accustomed to leading her life perfectly according to her own well-designed plans. But when Maggie learns that she has a half-brother her own age who needs a place to stay, any semblance of a plan is shattered. Tony’s mom struggles with an addiction to opioids, and now she’s called upon Maggie’s dad—who’s also Tony’s dad—to take him in… Read more.