أَخُوكَ قَادِمٌ
Your brother is coming.
أَخُوكَ: a nominative mubtadaʾ, marked by wāw because it belongs to the five nouns; the attached kāf is its genitive possessor.
قَادِمٌ: the nominative predicate; an active participle reporting impending arrival.
The proposition is that the brother is coming. Although it lacks additional reinforcement, the sentence remains complete and eloquent. Absence of emphasis is not a weakness; for an uninformed listener it can be the appropriate rhetorical choice.