I appreciate your response, and hoping you have some more input on these Westchester Losee's.
As you know there are several Losee "Locea" families in Westchester Co. by 1790, and none of these have been satisfactorily placed in the larger Losee family. In short, the family seems to have been headed by Cornelius Losee/"Locea", who died between 1800/1810, leaving three sons: Abraham, Daniel, and Joseph. These men were born between 1750-1765, and each man left numerous descendants. There may have also been a sister, Charity, who apparently married an Amos Archer.
Who is this Cornelius Losee (c1730-1800/1810), and where does he fit in the Losee genealogy? A couple of theories:
1. My first idea is see if I can find other Losee's present in Westchester Co. NY in the mid 18th century, as potential fathers of Cornelius. I have found two: Lawrence Losee and Townsend Losee.
a. Lawrence Losee - I believe this is the same man that was born in 1704/5, son of Simon Losee, and who married Rachel Delange. According to abstracted will of Simon Losee of Wheatley/Bushwick, son Lawrence Losee was in Westchester Co. in 1760. A Lawrence Losee, which may or may not be the same man, was enumerated among the tenants-at-will in the Cortlandt Manor books - see the "Manor of Cortlandt and Its Tenants", a dissertation by Sung Bok Kim (1966). This Lawrence was among 12 men evicted 1762-1773.
b. In the same dissertation, there was also a Townsend Losee who was a tenant at least between 1769-1772. I have no further information on him. Mackenzie, and as far as I know, Seversmith, do not address him.
There is no evidence to support my theories that one of these men fathered Cornelius Losee of Greenburgh. However, Lawrence Losee, at least, was of the right generation and location to be a possibility.
2. Another theory is based on Mackenzie's work, Families of the Colonial Town of Philipsburgh, which states that Cornelius Losee was born in Jamaica in 1720, the son of Lawrence Losee of Bushwyck (1684-1738). I found no record of a baptism for a Cornelius Losee in Jamaica, and no other evidence to support this claim. This Lawrence was dead by 1738, and as far as I know never set foot in Westchester County. I have not found any record of Lawrence's birth in 1684, but Mackenzie and others have listed him as a son of Cornelius Janszen who married Geertje Colf/Kolf.
3. He is probably not the Cornelius Losee who married Deborah Langdon. This man was born in 1705, and is unlikely to have sired sons in the 1750's and 60's and then lived into the early 1800's. Mackenzie has him as settling in Hopewell, Dutchess County in abt 1732, with children: Mary, Thomas, Abraham, John, and Joseph.
4. Probably the likeliest theory is that Cornelius Losee descends from another and entirely unrelated Losee family based in Brooklyn.In Seversmith's manuscripts, Seversmith lists a Lowes, born 9 Oct 1661, son of Lowse Byose and Annetje Jurians. This man was in Jamaica, NY, where he was known as Lowes Loetse or Lowyszen. His will, dated 1738 and proved in NYC, mentions wife Mary, and children: John, Charity, Elizabeth, Abigail, Cornelius, William, and Mary. This man seems a little old to father a man living into the early 1800's, but perhaps he is a grandfather?? This is probably the man that confused Mackenzie and other researchers who listed him as the son of Cornelius Losee of Bushwyck, and gave him a birthdate 20 years later to compensate for having children in the 1720's.
Anyway, this is where my research stands at the moment, and if you have any ideas or insight on this line, I would sure appreciate hearing from you. Thanks