Who was the brother of XXX?
Andrew the Apostle
Andrew the Apostle (Greek: Ἀνδρέας, Andreas; from the early 1st century -- mid to late 1st century AD), also known as Saint Andrew and called in the Orthodox tradition Prōtoklētos (Πρωτόκλητος) or the First-called, was a Christian Apostle and the elder brother of Saint Peter.
Peter