Yumiko_Sagara Hi there, it does not matter who made the inappropriate room. If an IP address is responsible for the room, then that IP address will get sanctioned. If the one to blame is your brother, please have him send an e-mail to support@drrr.com to appeal the ban.
Make sure to attach the IP address so we can look at why, and also later lift the ban. If you're unsure how to find your IP address, simply google "My IP address".