We can say 'A brother of mine is a doctor.' The more common way of saying is 'One of my brothers is a doctor.'
But in a case where a listener knows my brother or I have only one brother.
Should we write 'the brother of me is a doctor.' Using 'mine' is wrong here as Mine would represent 'my brothers'(more than one brothers) ?
I know there are other better ways to say it but I want to know that this one is grammatically correct or not.