Huh Never heard of the brother thing. Well that would be intersting. When selecting Resistance you play as the brother who stayed and Secuirty you are the brother who switched.
I haven't heard of it either, but I read an interview of Richard Ham and Neil Alphonso which when asked about the level of gore in the game they replied: "excessive gore doesn’t really fit with the tone of Brink, a world where
friends and brothers are reluctantly battling each other for what they see as a better future for all on the Ark."