When a person leads Two Boys in Prayer, where should He place Them?
Question :
When a man leads two or more boys who have not yet reached seven years of age, where should he place them, behind him, or on his right side?
Answer:
The Sunnah for worshippers who have reached seven years of age or more, is to stand behind the Imam, like adults. However, if there is only one, he should stand on the right of the Imam, because it has been authentically reported from the Prophet that he prayed in the house of Abu Talhah and he placed Anas and the orphan behind him and Umm Sulaim behind them. And it has also been authentically reported from him in another narration that he led Anas in prayer and he placed him on his right side and that he led Ibn 'Abbas in prayer and placed him on his right side.
Source:
The Permanent Committee
Fatawa Islamiyah, Vol. 2 Pages 326-327