وَصَـٰحِبَتِهِۦ وَبَنِيهِ ۝٣٦ What marks the genitive case of بَنِيهِ?

Surah ‘Abasa — Part 5

• Nominative, marked by wāw
• Accusative, marked by alif
• Jussive, marked by sukūn
• Genitive, marked by yāʾ