owe Well.... Its best we tell him. We all know that Knux's Mother had a Husband before the present one... (Whos dead) xD but... I dont know. Onyx and Knuckles are very close, Knux knows Onyx but he doesnt know that he is his half brother......
"Would You Shut Up?! We're Not Gonna Die! *Engine Dies* Ok, We're Gonna Die!" ~ Ratchet