Are Nick and Ellis from left 4 dead 2 brothers

no they arent as they claerly dont know each other in left 4 dead 2 when they say who they are and ellis and nick dont know each other in the elevator of dead centre chapter 1


and the person before me siad they talk about were they go he obvisaly hasnt played the game because they talk to each other and nick only talks at least 2 time ellis is chatty and talks about 6 or 8 times in a whole chapter