زَيْدٌ أَبُوهُ قَائِمٌ: the inner predicate is a nominal clause.
زَيْدٌ قَامَ أَبُوهُ: the inner predicate is a verbal clause.
In both cases «ـهُ» links the clause to Zayd, but the inner clause has a different structure.
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Compare the Two Source Clauses
Types of Khabar and the Linking Pronoun
زَيْدٌ أَبُوهُ قَائِمٌ: the inner predicate is a nominal clause.
زَيْدٌ قَامَ أَبُوهُ: the inner predicate is a verbal clause.
In both cases «ـهُ» links the clause to Zayd, but the inner clause has a different structure.