Hadith.4509 - Abdullah ibn Maymun narrated from Imam Jafar ibn Muhammad Al-Sadiq (as) from his father, Imam Muhammad ibn Ali Al-Baqir (as), from his forefathers (peace be upon them), who said
The Messenger of Allah (swt) (peace and blessings be upon him and his family) said: "A boy and a boy, a boy and a girl, and a girl and a girl should be separated in their sleeping arrangements at the age of ten years."