Capt John Grattan Guinness was born on 1 September 1783, his father, Arthur, was 57 and his mother, Olivia, was 41. He married Susannah Hutton and they had four children together. Christened at Beaumont, Dublin on 1 Sept 1783. He then married Jane Mary Lucretia Cramer and they had four children together. He served in India then reurned to Dublin.Heading what is known as the Missions Branch of the family .He died on 3 March 1850 in Gloucestershire at the age of 66, and was buried in Cheltenham, Gloucestershire.
↑ Ancestry.com. Ireland, Marriages in Walker's Hibernian Magazine, 1771-1812 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2014. This collection was indexed by Ancestry World Archives Project contributors. Original data: Farrar, Henry. Irish Marriages: Being an Index to the Marriages in Walker's Hibernian Magazine, 1771 to 1812. London, England: Phillimore & Co., 1897.
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It may be possible to confirm family relationships with John by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with John: