A birth certificate is the only document that can link you with your brother because you have the same parents. Without it, you will not qualify for points on "blood relationship".
from what I know U can show any document that would have one parent in common for both of u.....it can be school or college leaving certificates for you and ur bro as it includes both parent's name....I hope this helps!!!!
Dear
Produce any document that carries fathers' name...like educational certificate, identity cards, your marriage certificate etc. These alternative docs are to prove that both of you are brother
DNA test for u n ur brother
Sworn affividavit from ur parents stating the names of their children ages n date of birth.
Your brothers international passport.