mini ipad lock out

Ask your brother to so the steps in the article below to make it 'your' iPad.

Selling/Giving Away Device.  *

May you elaborate? Prima facie, the case seems very simple; i.e. you do not know the passcode.

If this is, indeed, the case, may you check this link?

Regards,

RRB

You need to ask your brother to unlock it for you, otherwise, you can't use it.