Who is akuma's brother?

GOUKEN Akuma (Gouki) is the brother of Ryu and Ken's late master: Gouken. Gouken and Akuma's master was called Goutetsu and tried to stop Gouki form using the dark hadou by battling him, Gouki killed Goutestsu using the Satsui no hado (dark hado), out of anger Gouken fought Gouki who later changed his name to Akuma to show his disconnection from his ''weak'' brother. Akuma again used the satsui no hado and murdered his brother Gouken.