This is a quick post to get something clear!
Aston has a blood brother, that would be Zephirin de Valhourdin, also known as Ser Zephirin. (Yes the one that kills the cinnamon bun)
Aston also has an adoptive older brother Licent Marquis. Those two got really close and decided to adopt each other after certain events.
We clear? Ok, good ^_^