If the hearer knows the brother but not his name, which order is apt?

Indefiniteness, Specification and Definiteness of the Predicate

• زَيْدٌ أَخُوكَ
• أَخُوكَ زَيْدٌ
• أَخُوكَ عَالِمٌ
• زَيْدٌ رَجُلٌ