Yes, there IS evidence of both my GGG-grandfather Samuel Churchill's origins in Tipperary AND his relationship to John Churchill of Admaston(in what today is the province of Ontario, Canada).
In the National Archives at Kew are muster rolls of the 3rd company, 3rd battalion of the Royal Sappers and Miners which show that Samuel Churchill enlisted on 13 Feb, 1812 in Thurles, Tipperary. His age at that time was 26 (which would make him born ca. 1786), he was a collarmaker by trade, 5' 6-1/2" tall, with black eyes, fresh complexion and brown hair. He could read and write. His place of birth is shown as Thurles parish, Tipperary, Ireland.
According to the "History of the Royal Sappers and Miners" by T.M.J. Connolly, published in 1857, which tracks in great detail the deployment of the RSMs, 3rd company, 3rd battalion arrived in Quebec City on 5 June 1813 on the transport "Zodiac." 3rd Company, 3rd Battalion was stationed at Kingston, Upper Canada, and was deployed in a number of locales during the American War of 1812-14.
After the war ended, Britain retained troops in Canada. By 1819 though, it was looking to reduce its complement, offering free land as an inducement for soldiers to stay in Canada (downsizing and severance packages have obviously been around for quite a while!!). Along with a number of others, Samuel transferred to RSM's 4th company in Quebec City in June 1819. At the end of the July 1819 muster roll -- under the heading "Alterations since last muster", Samuel Churchill and a number of others are recorded as "Discharged in consequence of a reduction. 30th June 1819." In November that same year, he received the first of two free land grants in the Perth Military Settlement.
My GG grandfather John Churchill's birth on 27 January 1819 and subsequent baptism are recorded in the military records of the Kingston Garrison, Upper Canada for 1819 and identify him as "John, son of Samuel Churchill, Private of R.S & Miners and Jane his wife".
John Churchill grew up in Lanark County and like his brothers, became a cooper. He married Esther Stoddarts (daughter of Robert and Jane Stoddart from County Leitrim, Ireland; baptised in Oct 1820 in Brockville) and moved west to Renfrew County. There he ran a cooper's shop in Renfrew, farmed in Admaston township, and also served his community as both a councillor and school trustee. In fact, he was one of five councillors elected when the Village of Renfrew was incorporated in 1858.
As yet, I have been unable to link Samuel Churchill to any of the other Churchill families from Tipperary. It's interesting though that Samuel named his first three sons William, John and Joseph (born 1816, 1819 and 1824 respectively)-- names that show up in the other lines as well. There was also a 4th son Thomas, b 1826 and two daughters, Elizabeth b 1823 and Jane b 1830.
Samuel Churchill's presence in Canada is documented in both military records and land petitions -- as is his origin in Thurles, Tipperary -- so there was very obviously a 5th line of Churchills who emigrated from this area of Ireland in the 1800s.
I am proud to be one of Samuel's descendants -- and would be thrilled to hear from anyone else researching this particular line of Churchills from Tipperary, Ireland.