[Machine] Umar ibn Abdullah and his sister were born to their father and mother Hafsah bint Umar, the wife of the Prophet Muhammad ﷺ . Their mother was Zainab bint Maz'un ibn Habib ibn Wahb ibn Hudhaifah ibn Jumah, and she was one of the Muhajirin (emigrants). Before the Prophet Muhammad ﷺ , she used to live with Khunais ibn Hudhaifah al-Sahmi, and her father and uncle, Zaid, witnessed the Battle of Badr. Her cousins were Uthman, Qudamah, and Abdullah, and Saib ibn Uthman.  

«فَوَلَدَ عُمَرُ عَبْدَ اللهِ بْنَ عُمَرَ وَأُخْتَهُ لِأَبِيهِ وَأُمَّهُ حَفْصَةَ بِنْتَ عُمَرَ زَوْجَ النَّبِيِّ ﷺ وَعَبْدَ الرَّحْمَنِ الْأَكْبَرَ وَأُمُّهُمْ زَيْنَبُ بِنْتُ مَظْعُونِ بْنِ حَبِيبِ بْنِ وَهْبِ بْنِ حُذَافَةَ بْنِ جُمَحٍ كَانَتْ مِنَ الْمُهَاجِرَاتِ وَكَانَتْ قَبْلَ النَّبِيِّ ﷺ عِنْدَ خُنَيْسِ بْنِ حُذَافَةَ السَّهْمِيِّ وَشَهِدَ بَدْرًا أَبُوهَا وَعَمُّهَا زَيْدٌ وَشَهِدَ بَدْرًا أَخْوَالُهَا عُثْمَانُ وَقُدَامَةُ وَعَبْدُ اللهِ ابْنُ خَالِهَا وَالسَّائِبُ بْنُ عُثْمَانَ»