What would Happend when Scourge and FireStar would Find out that they are Half Brothers?

WOAH! ,okay well uhm...
actually kind of easy... i really Like Scourge and FireStar ,i always knew they were kind of half bros but i actually feel sorry for those both.

i actually wanted to see thier Reaction if they found out They were half Brothers...
anyways i Hope you have an Idea! <3