Sayyiduna Anas bin Malik (may Allah be pleased with him) narrates that I and a boy stood behind the Prophet (peace and blessings of Allah be upon him) and performed prayer, while my mother stood behind us and performed prayer.
Hadith Referenceصحيح ابن خزيمه / جماع أبواب قيام المأمومين خلف الإمام وما فيه من السنن / 1539