Conversation so far:
What year was Zheng He born?
Zheng He was born Ma He to a Muslim family of Kunyang, Kunming, Yunnan, China.
How big was his family?
He had an older brother and four sisters.
What did his siblings do?
CANNOTANSWER.
Where were his parents?
CANNOTANSWER.
What else can you tell me about his family?
His great-grandfather was named Bayan and may have been stationed at a Mongol garrison in Yunnan.

Question: Was anyone else captured in the family?
Self-contained rewrite: Was anyone else captured in Zheng He's family besides Bayan?