My brother owes me $10. i already have $10. my dads friend gave me and him $20 to split in half. he gave me the $20 and took my $10. does he still owe me. explain plz

Yes...     You have $10
               your brother is supposed to give you $10
               he gives you the money the friend told him to and you would have $20 PLUS the ten that he owes you. That would make you have $30. He took youre ten and gave you 20 but you were supposed to have 20 in the first place. He needs to give you the ten back he owes you.