But "my brother" is the subject
As it is followed by "is", third person conjugation of "be". Of course, there is some debate as to use the object pronouns or subject pronouns with "be"; classically, instead of "It is me", it used to be "It is I". Upon hearing this, I immediatally dimissed it as nonsense. However, in some phrases such as "It was him who did it", perhaps it would make more sense as "It was HE who did it", as in the clause "he/him who did it", "he/him" clearly is a subject and not an object. It could be argued that "he/him" is a subject of "It was", but in that case, we'd have to concede that "He is bigger than her is" is grammitically correct based on "He is bigger than her", which is of course nonsense.

In conclusion: someone needs to come along and sort out the English language.
(Cuthbert Annihilator, Wed 16 Jul 2008, 18:03, Reply)