i thought wedding invitation is usually parents sent one (in
name lah)
i.e. Mr & Mrs ABC
&
Mr & Mrs XYZ
would like to invite
so & so
to witness the wedding (blah blah blah)
of their son/daughter etc etc etc.
if it's your brother, then it's their son.
SO, no need to invite.
just ask your parents to call them can liao...