Faster

Kanan Jarrus thought he was the only person in his family alive. Then he met Ash. Her last name was Dume like Kanan's used to be. Then she she told him she changed her last name to Jarrus when she found out that's what her brother did. Could this be possible?

This book takes place 1 year after they met.

(No I'm not the person who makes Star War Rebels, sadly. I wish I was)