Hadith 543
Abu Qatadah (RA) al-Ansari reported: I saw the Apostle (ﷺ) leading the people in prayer with Umama, daughter of Abu'l-'As and Zainab, daughter of the Apostle of Allah (ﷺ) , on his shoulder. When he bowed, he put her down, and when he got up after prostration, he lifted her again.
Hadith 732
'A'isha reported that the Messenger of Allah (ﷺ) died (in this very state) that he observed most of his (Nafl) prayers in a sitting position.