This was posted on my wall rather than here, I am copying it here to extend the conversation: Thanks for your response, but the "Historical & Genealogical Memoirs of the House of Hamilton", p. 244 states that Sir Frederick Hamilton & Sidney Vaughan had 4 children: James, Frederick, Gustavus, & Christiana. This James married his 1st cousin, Catherine Hamilton, daughter of Claud, the 1st Lord Strabane in 1647; they had 2 daughters, Hannah & Sidney. James was born before 1632 and died 27 Dec 1652. The websites genealogy.euweb.cz, cracroftspeerage.co.uk, and thepeerage.com confirm the above records. The Manor Hamilton associated with Sir Frederick's son James is located in County Leitrim; the Hamilton Manor associated with the 1662 Judith Hamilton is located in County Tyrone. I think that mistakes have been perpetuated on Ancestry.com; the birth and death dates mean nothing.