Did the Prophet, peace and blessings be upon him, ever meet his grandmothers or any of his maternal uncles or his maternal grandfather? And have any stories been reported about them from his childhood or youth?

It is not mentioned in the books of Sirah (Prophet's biography) that the Prophet, peace and blessings be upon him, met his maternal grandfathers, or his maternal grandmothers, or that any stories were narrated about them. As for his maternal uncles, he did meet some of them, including: Al-Aswad ibn Wahb, and Abd Yaghuth ibn Wahb (Al-Aswad's father), and it was also said Umayr ibn Wahb. Narrations have been reported about the Prophet, peace and blessings be upon him, meeting Al-Aswad ibn Wahb and Umayr ibn Wahb, where he spread out his cloak for them and said: "The maternal uncle is like a father."