Magic!

Rylie and Ethan are 15 year old twins and they only have each other. They take care of each other and fight with their fathers enemies almost weekly when they are having meetings and they try to crash them. When Ethan gets hurt and realizes that Rylie could help him, he takes weeks training Rylie to help him and because he misjudged her for her being a girl, and it takes half the time it took him to train himself to train her. After Rylie's first mission with Ethan, they discover that Rylie has magical powers.