William was born before 1764. He is the son of George Sinclair and Katherine Spence.
Source: [S675974210] Ancestry Family Trees
Source: [S681095450] Scotland Births and Baptisms, 1564-1950 Note: William Sinclair Scotland Births and Baptisms, 1564-1950 Name: William Sinclair Event Type: Christening Event Date: 27 May 1764 Event Place: Stromness, Orkney, Scotland, United Kingdom Event Place (Original): Stromness, Orkney, Scotland Sex: Male Father's Name: George Sinclair Mother's Name: Kathren Spence Citation "Scotland Births and Baptisms, 1564-1950", database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VQQP-PPX : 12 February 2020), William Sinclair, 1764.
Source: [S681095494] Scotland, Select Births and Baptisms, 1564-1950 Note: Name: William Sinclair Gender: Male Baptism Date: 27 May 1764 Baptism Place: Stromness,Orkney,Scotland Father: George Sinclair Mother: Kathren Spence FHL Film Number: 0990514, 0990515, 990514
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