Apologies for the late reply.
I banned you on 06-17-2013 for griefing and no constructive edits on our creative server, c.nerd.nu
Typically, we do not accept siblings accessing your account as an excuse, as you are responsible for your account information. However, as I am late to replying to this appeal, I will give you a chance.
Please post which rule on http://nerd.nu/rules that was broken, and I will unban you.
Also, I'd like to note that I was mistaken. You were banned from our survival server for the same reason.