...My mom committed suicide when I was a bit smaller, and I became a Comrade. My dad kicked me out, thinking I killed her and called me a monster. I was on my own like you, until I found people to fight and travel with, at least until I was put in here.
[And they are, which he can use to his advantage if he needs to.]
He's a brat for sure, and he's kicked people before. But, he was a good kid too. Plus, if he teases you it usually means he likes you.