This has been handled already but there are a few questions left unanswered.
You got banned on your main account (STEAM_0:1:157422774) on the 21st of August at 12:45 AM for 2 days by Orange.
38 minutes later, your "brother's" account (STEAM_0:0:211292709) gets banned for ban evasion by a family sharing check triggered by Ian Carter, which led to the console permanently banning that account due to ban evasion.
Then 20 minutes later, another account (STEAM_0:0:227823702) connected via family sharing gets banned as well for ban evasion, detected by the same admin Ian Carter.
STEAM_0:1:157422774 punished by |W| Orang3 (STEAM_0:1:99947585). Banned on 21/08/2017 - 00:45:51 for 2 day(s) with reason Constant Prop Push, Recent Punishments (8 warns)...
STEAM_0:1:157422774 punished by Ian Carter #NutBoy (STEAM_0:1:74246881). Family Ban on 21/08/2017 - 01:23:27 for joshysquashy648888 (STEAM_0:0:211292709)
STEAM_0:1:157422774 punished by Ian Carter #NutBoy (STEAM_0:1:74246881). Family Ban on 21/08/2017 - 01:44:43 for Moonman648888 (STEAM_0:0:227823702)
Looking at the rapsheet there are some anticheats ran on your account and your "brother's". Quite dodgy you both have the same resolution. As well as the fact that your "brother" has roughly 12 hours on the game, 10 of those being in the past 2 weeks, having registered on Steam in April 2017. Then the 3rd account that has 5.4 hours on the game in the past 2 weeks, having registered on Steam a day before getting banned.
Mind explaining? Because what it seems to me your alternate account must remain banned.