How Ya Like Me Now — Brendan Halpin

When Eddie moves in with his cousin Alex, his world is turned upside down 

Eddie's life is changing. When his widowed mom is sent to rehab, he goes to Boston to live with his aunt, uncle, and cousin Alex, a smart-mouthed extrovert whom the withdrawn Eddie has a hard time understanding.
 
As they negotiate the difficulties of girls, homework, friendship, and more girls, both boys will come to realize that they have a lot to learn from each other -- and that it's easier to face the world when someone has your back.