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Category Archives: Corrin

DNA: finding new connections with the latest tools

07 Thursday Mar 2019

Posted by Anne Young in AncestryDNA, Corrin, DNA, DNA Painter, Isle of Man, La Mothe, MyHeritage, tree completeness

≈ 4 Comments

AncestryDNA and MyHeritage have recently released new tools for showing how you might be related to your DNA cousins. Both companies look at your tree and the tree of your DNA cousin. If those trees do not connect, the company tentatively connects them using in addition other public trees in their databases.

Cousinships found in tentatively-connectly trees of course need to be verified. However, although you may seem to descend in the way suggested by the tentatively-connectly trees it is possible that you could be also descended from other ancestors not presently shown on the family trees. Confidence that the DNA match is from a particular couple increases with tree completeness. This confidence increases for both you and your match if your are able to establish that there are likely no other shared ancestors. Increased confidence that you are indeed related to the suggested DNA cousins comes from sharing common ancestors and simultaneously sharing DNA other cousins who also descend from the same common ancestors

AncestryDNA’s new Thrulines tool has given me many more Common Ancestor Hints to look at. I decided to look at DNA cousins who are also descended from my fifth great grandparents Dominique Pierre La Mothe (1731 – 1807) and his wife Susannah La Mothe nee Corrin (1741 – 1803). ThruLines suggests that my father may be related to 8 DNA matches through Dominique Pierre Lamothe.

ThruLines_for_Dominique_Pierre_Lamothe 1.jpg
One of these matches is me; another match is one of my second cousins, my father’s first cousin once removed. These relationships are well documented. We have met my father’s third cousin, R, and I also have confidence in the documentation of that match. However, we have not met H, my father’s 3rd cousin once removed. The relationship corresponds with my family history researches, and the shared 21 centimorgans of DNA fits within the range of a 3rd cousin once removed relationship as predicted by the shared centimorgan tool at DNAPainter.com.

Four matches descend from other children of Dominique and Susannah La Mothe.

ThruLines_for_Dominique_Pierre_Lamothe 2.jpg

These matches were all new to me. I had not previously corresponded with these cousins, nor was I aware that our trees had common ancestors. The shared DNA is small, but is greater than the 7 centimorgan small-match-limit usually suggested for genealogical significance. The number of shared centimorgans corresponds with the hypothetical relationships.

I decided to review cousin C who is predicted to descend from Frederick John Dominique Lamothe (1805 – 1864). I had not previously documented his descendants. The family tree attached to C’s DNA has only 27 people: she lists paternal grandparents and her mother, who died in 2015; there are no maternal grandparents listed. Thrulines incorrectly shows C’s grandfather’s information as common from her tree, but that does not correspond with the only public member tree attached to her profile, so perhaps C has a private but searchable tree on Ancestry.com.

I traced 13 children of Frederick John Lamothe, of whom five were daughters. His youngest daughter Ann Jane Lamothe (1857 – 1929) married William Galloway (1854 – 1909) on 5 August 1879 at Lezayre, Isle of Man. They had ten children. The second oldest was William Edward Galloway (1884 – 1967). That he was the father of Jean (1927 – 2015) is documented on a 1951 US Border-crossing document from Canada to the US. Her husband is also named in the document, further confirming the family relationship to C. I am satisfied with the genealogical links between C and Dominique Pierre and Susannah Lamothe based on baptism, marriage, death, and census records as well as the border-crossing record.

My father has eight matches at MyHeritage where MyHeritage has build speculative trees that may explain how Richard Rafe Champion de Crespigny and some of his DNA Matches are related. Of these I had already determined the connection for six and been in contact with the six cousins. The other two matches are his cousins, brother JJ and sister MJ, whose DNA kits are administered by Jo M, the daughter of JJ. My father shares 31.3 centimorgans of DNA with MJ and 8.3 centimorgans with JJ. The shared DNA figures are within the range appropriate for 5th cousins.

MJ Theory_of_Family_Relativity™_-_MyHeritage

My Heritage demonstrates how the two trees combine and gives a level of confidence about the match, in this case 82%. While I did not have these cousins on my tree previously I have now added these descendants to my tree on the basis of birth, death, marriage, and census records.

MyHeritage provides a chromosome browser and lists segment details. I have painted these matches on to my father’s DNAPainter profile. The overlaps of the segments all correspond with forebears who descend from Dominique Pierre Lamothe and Susannah Corrin. To date 25% of my father’s DNA has been attributed to named forebears.

2019 07 03 DNA_Painter___Profile_-_Rafe_de_Crespigny

In his talk Essential Considerations for DNA Evidence, presented at RootsTech 2019, Blaine Bettinger, an American genetic genealogist claimed that “Without a report of tree completedness, it is nearly impossible to evaluate the use of DNA in a genealogical conclusion, even if it is soundly supported by documentary evidence!”

I last looked at tree completeness in May 2018 when I could name 45 of the possible 64 5th great grandparents I had. I did not split my result between my father’s family history and my mother’s but when I reviewed the statistics, it appeared that 44 of my possible 5th great grandparents that I know of are on my father’s side. That is, I know the names of 68% of my father’s fourth great grandparents, the generation that includes Dominique and Susannah LaMothe. I have improved my knowledge slightly. I now know 70% of my father’s 3rd great grandparents and 42% of my father’s 4th great grandparents, i.e. those forebears he would share as most common recent ancestors with fifth cousins. The overall tree completeness score at the 5th cousin level for my father is that we know 106 of a potential 127 individuals or 83%: 17% of the tree is unknown.

2019 03 07 tree completeness 6 gen from RdeC

Chart showing the fourth great grandparents of Rafe de Crespigny. (Generated using MacFamilyTree)

In the case of the Thrulines match with C, her tree has only 27 people and could not be regarded as complete.

In the case of the MyHeritage tree maintained by Jo M and associated with the matches of MJ and JJ, the tree has only 84 people and is also incomplete. Jo M has trees on Ancestry.com but they show that Jo M has shown only 41 of the people associated with the trees of JJ and MJ up to the 4th great grandparent level, or 32%; thus her tree could be said to be 68% incomplete.

AncestryDNA’s Thrulines tool and MyHeritage’s Theory of Family Relativity tool are similar. Both tools have come up with matches at the fifth cousin level that seem plausible. In verifying the lines of descent and contacting the matches, I have discovered a little more about the descendants of my forebears. One cousin, Jo M, has shared pictures she took of our forebears’ graves on the Isle of Man. She has also traced the La Mothe family line further back than I have.

Related posts

  • S is for Suky
  • Progress on my tree
  • DNA Painter – a new tool

S is for Suky

21 Saturday Apr 2018

Posted by Anne Young in A to Z 2018, Chauncy, Corrin, Isle of Man, La Mothe, Liverpool, prisoner of war

≈ 11 Comments

One of my fifth great grandmothers was Susannah Lamothe née Corrin (1741-1803).

Susannah was the daughter of Henry Corrin (1713-1769) and Susanna Corrin née Quay (1713-1784). In 1763 she married Dominique Lamothe (1731-1807), a former French prisoner-of-war.

Lamothe Corrin wedding 1763

The marriage record of Dominique Lamothe and Susannah Corrin at St George’s Liverpool on 6 April 1763 retrieved from Liverpool, England, Church of England Baptisms, Marriages and Burials, 1659-1812 Reference Number: 283 GEO/3/1 through ancestry.com

Lamothe had been a surgeon on the St Lawrence, a privateer  brig, which was captured by the English and brought to Douglas, the Isle of Man, on 31 October 1760. England and France were at war, in what was later known as the Seven Years’ War (1756-1763). After their capture the officers and men of the St Lawrence were held in Castle Rushen as prisoners of war.

Two weeks after their capture the French officers of the privateer St Lawrence applied to the Governor of the Island for their liberty, and joined themselves in a bond to Messrs. Ross, Black, and Christian, of Douglas, merchants.  They were freed from gaol on parole.

In January 1761 the Lords of the Admiralty sent a British ship to take the prisoners of war off the island. All prisoners were delivered up except for Lamothe and Lieutenant Lessenne, who were exploring the island. Lessenne turned up on the evening of the next day, Lamothe later that night, but the tender for the boat had gone so Lamothe was placed back in Castle Rushen. Because of adverse winds the ship had been unable to wait. It seems that Lamothe was again freed from Castle Rushen, though there is no detail as to how this came about. There is a family story that Lamothe “attended the Governor’s wife as her medical man, and acted with great skill, and was thereupon released.”

In a letter of 30 September 1763 to Basil Cochrane, Governor of the Isle of Man 1751-1762, John Quayle ( Clerk of the Rolls for the Isle of Man and the Duke of Atholl’s Seneschal), reported on some local Manx happenings  :

the French Doctor was no sooner released from being a prisoner of war than he became captive to Suky Corrin (the daughter of his landlord, Hall Corrin). He went to France for his prize money, bought a cargo of Brandy to Dublin & this day returned to his spouse.

Dominique Lamothe and Susanna had eleven children. They lived in Castletown, Isle of Man, where he practiced medicine for 47 years.

Susanna died on 9 November 1803, aged 62. Dominique on died 8 January 1807 aged 74. They are buried at Castletown.

Their youngest daughter Rose Therese Lamothe (1784-1818) married William Snell Brown later Chauncy. She had three children:

  • Theresa Susanna Snell Chauncy 1807-1876
  • Martha  Maria Snell Chauncy 1813-1899
  • Philip Lamothe Snell Chauncy 1816-1880 my 3rd great grandfather.

Rose died shortly before her son’s second birthday. In his memoirs, Philip Chauncy wrote  “Having always resided at a distance from the Isle of Man, I have never known much of my Mother’s relations.” He knew his grandfather had been a prisoner of war and had been in correspondence with his cousin John Corlet LaMothe who had compiled the history of Dominique and Susanna from the records in the Rolls office of the Isle of Man.

Sources

  • Family of LaMothe by John Corlet LaMothe in 1895 and reproduced at http://www.isle-of-man.com/manxnotebook/famhist/families/lamothe.htm
  • Moore, A. W.. Manx worthies, or, Biographies of notable Manx men and women. Douglas, Isle of Man: S.K. Broadbent & Co., 1901. page 151. Available through ancestry.com and http://www.isle-of-man.com/manxnotebook/fulltext/worthies/ch07.htm#151
  • Copy of letter from John Quayle to Basil Cochrane 30 September 1763 From Atholl Papers – AP X17-25 retrieved fromhttp://www.isle-of-man.com/manxnotebook/history/ap/ap_x1725.htm The Atholl Papers are a very large archive of over 7,500 manuscripts & books donated to the Manx Museum (Manx National Heritage) in 1956 that cover the period from 1735 through to 1765 when the Dukes of Atholl were Lords of Man.
  • P. L. S. Chauncy. Memoirs and other papers held by the State Library of Victoria MS 9287
  • Lamothe Mausoleum was erected in 1845 in the Lezayre Churchyard, Lezayre, Isle of Man http://www.mmtrust.org.uk/mausolea/view/476/Lamothe_Mausoleum
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