Each of my brothers wants his own car
I already know that each is always paired with singular but is the usage of "his" correct? Should it be "their" or "it"?
Each of my brothers wants his own car
I already know that each is always paired with singular but is the usage of "his" correct? Should it be "their" or "it"?
Your sentence is correct.
"Each" is indeed a singular pronoun, so the singular "his" is correct.
"Their" is naturally used about people when the sex is unclear:
Each of my siblings wants their own car.
It's becoming more common to use "their" when the sex is clear, as in your example sentence, but some will still insist on using "their" only when the sex is unclear. So in daily life, "his" or "their" are both fine, but in class, or for an assignment or exam, use the singular as much as you can.
"It" isn't the right part of speech at all. "Its" is the correct part of speech, but is incorrect because brothers are people, and "its" only refers to non-humans.