I would suggest setting up family sharing, because someone else having access to your account is a conflict. (both for a potential staff and for any user) Your brother's mistakes/rule violations will be analyzed as if they were yours. In addition, if you were to be accepted as staff a third party would have access to staff commands. I hope you understand the problem with this situation. Anyway, please setup family plan on steam. Basically it allows separate users (different accounts) to share games they have purchased, with others. If you need any help with setting it up, let me know. PM me on the forums, TS, or in game, for help. In the meantime I am going to -1
The above is no longer an issue and has been fixed. The one issue I now have is that it seems you are not known by myself or many others in the community. You can fix this by doing the following: going on TS, being more active in-game, being active on the forums.
When reviewing staff apps, HR takes the applicants character and other factors into consideration. Since myself and others have no interactions with you, there isn't really anything to go off of but your application itself.
-1