إِنَّ زَيْدًا أَبُوهُ قَائِمٌ
Translation: Indeed, Zayd’s father is standing.
«أَبُوهُ قَائِمٌ» is an inner nominal clause. The whole inner clause functions as khabar inna; «ـهُ» links it back to Zayd.
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A Nominal Clause as Khabar Inna
The Predicate of Inna and Its Sisters
إِنَّ زَيْدًا أَبُوهُ قَائِمٌ
Translation: Indeed, Zayd’s father is standing.
«أَبُوهُ قَائِمٌ» is an inner nominal clause. The whole inner clause functions as khabar inna; «ـهُ» links it back to Zayd.