In the beginning I immediately thought you deserved a second chance, we all do something stupid once, but then from the "I was banned for faking a staff member, I'm sorry I won't do it again" and your friend saying the same, you changed to "my brother faked a staff member and got me banned", now you're also saying your brother got banned and you're not banned. Now please explain all these? How are you not banned and your brother is? Different IP? If so, how did you get banned along with your "brother" in the first place? Last but not least, I aint eating the excuse "I was banned but I joined I didn't know I'm sorry...." and so on, you apologised and explained so you clearly knew you shouldn't have joined. Not to mention you extended 9 months to 5 years so that your case gets forgotten and forgiven I guess.
My conclusion: Guilty of faking a Staff member, lying about it(unless he can prove his brother exists and played here) and ban evading. He should stay banned.