The Book of Leading the Prayer (Al-Imamah)
10/21. Chapter:
Where an Imam should stand when there is a boy and a woman with him
Sunan an-Nasai
أَخْبَرَنَا عَمْرُو بْنُ عَلِيٍّ، قَالَ حَدَّثَنَا يَحْيَى، قَالَ حَدَّثَنَا شُعْبَةُ، عَنْ عَبْدِ اللَّهِ بْنِ الْمُخْتَارِ، عَنْ مُوسَى بْنِ أَنَسٍ، عَنْ أَنَسٍ، قَالَ صَلَّى بِي رَسُولُ اللَّهِ صلى الله عليه وسلم وَبِامْرَأَةٍ مِنْ أَهْلِي فَأَقَامَنِي عَنْ يَمِينِهِ وَالْمَرْأَةُ خَلْفَنَا .
It was narrated that Anas said: "The Messenger of Allah (ﷺ) led me and a woman from my family in prayer. He made me to stand on his right and the woman to stand behind us."
Reference : Sunan an-Nasa'i 805In-book reference : Book 10, Hadith 29English translation : Vol. 1, Book 10, Hadith 806