It says @TheSupremePatriot banned you for ignoring staff orders and building in spawn, whether or not it was your little brother, you both should heed the staff warnings. Especially since it looks like TheSupremePatriot already did a 1 hour ban on your account for the exact same reason.
Regardless of your innocence or not, the ban is only a day long and you could most certainly wait it out and explain how to listen to staff and read the rules to your 'brother'.