John Mousley Yates (known as "Jack") was born Jan 11, 1844 and baptized 26 Jan 1845 at Old Church, Saint Pancras, London, England. His parents were John Yates and Sarah Mousley.  He was the second of four children: Sarah, John Mousley, William Henry, and Katherine Elizabeth. His older sister was born in Burton-on-Trent, but at some point the family, along with Sarah's sister Catherine moved to London.
In 1851 the entire family, including Aunt Catherine, were all living at 66 Jermyn Street in London,  presumably above the tailor shop kept by his father John. Jermyn Street has long been a place where the wealthy shopped. In fact the shopfront at 66 Jermyn is still there today and is occupied by a retailer of men's bespoke shirts.
Both parents died in 1857, leaving the 4 youngsters as orphans (Jack was 13).  After his parents' death he and his siblings and Aunt Catherine Mousley returned to Burton-on-Trent.  Perhaps they all later emigrated together because they had learned to rely on each other when they were young.
Family legend says that Jack was "educated as an engineer at Oxford" but this seems unlikely as at the time only the very wealthy could afford to send their children to Oxford; also, Oxford did not have an "engineering" program, and finally, the records for Oxford students of the time have been checked and he was not on the list.
John Yates migrated from England to Louisiana.
We know that his brother William Henry emigrated to America first, but have not as yet found his emigration records. Family legend has it that William Henry went to Australia first, but did not like it. This has yet to be substantiated. Jack followed William Henry to America in 1867. The story of Jack's journey to America is recorded in his diary which has been transcribed and uploaded here. His journal notes that he arrived on the 8th, but the ship's log records that they arrived on the 11th. 
He applied for naturalization in 1869, only two years later.  His sisters Sarah and Katherine Elizabeth came over in 1873, when William Henry came over (the second trip) with his new wife Mary Elizabeth.
In 1870 Jack was single and living in St. Tammany Parish. By 1880 Jack was married and living in Sandy Ford, Louisiana with his wife Sarah Jane Blocker (Yes, another Sarah!) and the first of his children: May, William, and Catherine Drusilla. His son William, who became known as "Henry," was named after his brother William Henry, while Catherine Drusilla was named after his sister Katherine Elizabeth. There is no Sarah in the second generation, but with a mother Sarah, a wife Sarah, and a sister Sarah, they may have simply been "Sarah'ed" out.
His sister Sarah had moved to Lake Charles to be a governess; she died in 1886, and his brother died in New Orleans 1888, both at comparatively young ages. We know very little about his sister Sarah, but for much more about his brother William Henry, see that profile. I suspect that John Mousley and William Henry were not on good terms later in life, because we have been able to find very few photos of William Henry, and John Mousley was not mentioned in William Henry's obituary.
By 1900, Jack and Sarah had completed their family, and 10 of the 11 children were still living at home, listed in the census as "Ward 1 Madisonville town, St. Tammany, Louisiana, United States." Jack's occupation is "farmer."  His wife died in 1900, when their youngest child, Susie, was just a baby. By 1910 many of the children have left home and the residence is listed as "Township 5, Ward 2, Folsom Precinct."
Jack was the Parish Surveyor for St. Tammany Parish. He, with his son Henry, laid out the town of Folsom. As such, any search of the St. Tammany Farmer newspaper will show hundreds of results, most of which are his published surveys and advertisements.  He served from 1894 until 1900.  '(NOTE: obituary says 1912, but article says 1900. Could validate with the paperwork? Check)'
His sister Kate married in Lake Charles and lived until 1909. His son John Spring and his daughter May visited her in Lake Charles, and his son Charles Murray was named for her husband Charles Douglas Murray. We know that John Mousley and Kate corresponded until her death, as we have a collection of her letters to him, including a detailed account of her last illness.
He also served as the Secretary of the Democratic Parish Executive Committee.  He was a Freemason, and was a charter member of Covington Lodge No. 188, F. & A.M.  In 1873 he was the Lodge Master of the chapter.
↑ 1.01.1 Ancestry.com. England, Select Births and Christenings, 1538-1975 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2014. Original data: England, Births and Christenings, 1538-1975. Salt Lake City, Utah: FamilySearch, 2013.
↑ 2.02.12.2 Ancestry.com. 1851 England Census [database on-line]. Provo, UT, USA: Ancestry.com Operations Inc, 2005. Original data: Census Returns of England and Wales, 1851. Kew, Surrey, England: The National Archives of the UK (TNA): Public Record Office (PRO), 1851.
Emigration from England to Louisiana, 1867
Name: John M. Yates
Arrival Year: 1867
Arrival Place: Louisiana
Source Publication Code: 6053.6
Primary Immigrant: Yates, John M
Annotation: Date and port of arrival; a few are date and place where petition was filed or date when settled in place cited. Extracted from records located in a "special cabinent" in the Clerk of Court's office, St. Tammany Parish Courthouse, 510 East Boston, Covingt
Source Bibliography: NEFF, MRS. AMOS E., and DORIS M. HOLDEN. "Petitions for Naturalization Filed in the St. Tammany Parish Court House." In Louisiana Genealogical Register. Vol. 42:1 (March 1995), pp. 88-93; vol. 42:2 (June 1995), pp. 279-282; vol. 42:3 (September 1995), pp. 378-380; vol. 42:4 (December 1995), pp. 447-449.
Quarterly Abstracts of Passenger Lists of Vessels Arriving at New Orleans, Louisiana, 1820–1875. M272, 17 rolls. Records of the U.S. Customs Service, Record Group 36. National Archives and Records Administration, Washington, D.C.
↑ 8.08.1 See uploaded scan - From the collection of Margie Yates Jenkins.
↑ 9.09.1 Source Citation. Year: 1870; Census Place: Ward 6, St Tammany, Louisiana; Roll: M593_532; Page: 44B; Image: 78781; Family History Library Film: 552031. Description. Township : Ward 6 Source Information
Ancestry.com. 1870 United States Federal Census [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2009. Images reproduced by FamilySearch.
Original data: 1870 U.S. census, population schedules. NARA microfilm publication M593, 1,761 rolls. Washington, D.C.: National Archives and Records Administration, n.d.Minnesota census schedules for 1870. NARA microfilm publication T132, 13 rolls. Washington, D.C.: National Archives and Records Administration, n.d.
↑ 10.010.1 "United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MDXJ-DLZ : 14 July 2016), Sarah Jane Yates in household of John M Yates, Sandy Ford, St Tammany, Louisiana, United States; citing enumeration district ED 174, sheet 362D, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0471; FHL microfilm 1,254,471.
↑ 11.011.1 "United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MSRH-YG9 : accessed 4 June 2017), John M Yates, Ward 1 Madisonville town, St. Tammany, Louisiana, United States; citing enumeration district (ED) 79, sheet 8A, family 88, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,583.
↑ 12.012.1 Year: 1910; Census Place: Folsom, Saint Tammany, Louisiana; Roll: T624_531; Page: 8B; Enumeration District: 0093; FHL microfilm: 1374544 Ancestry.com. 1910 United States Federal Census [database on-line]. Provo, UT, USA: Ancestry.com Operations Inc, 2006. Original data: Thirteenth Census of the United States, 1910 (NARA microfilm publication T624, 1,178 rolls). Records of the Bureau of the Census, Record Group 29. National Archives, Washington, D.C.
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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 DNA with John: