[2] According to his son-in-law, Donald Fisher, his paternal grandfather was Alexander Munro, Laird of Killichoan,[3][a] and his maternal grandparents were Sir John Munro, 4th Baronet, a Scottish nobleman, and Lady Agnes Mackenzie (a daughter of Kenneth Mackenzie, 3rd Earl of Seaforth).
Munro was ordained in the church of England in 1765 and then returned to America where he conducted a mission on Philipsburgh Manor in Westchester County.
In 1768, Harry Munro left Yonkers to become the rector of St. Peter's Church in Albany where he had considerable influence among the Mohawks.
His first wife, the widow of a regimental officer, died in 1760 leaving him with an infant daughter:[2] Around 1763, he married a Miss Stockton from Princeton, New Jersey and built a house there.
[11][12] Her younger brother was John Jay (who later became a Founding Father and was the second governor of New York and the first chief justice of the United States).