First, you shouldn't be surprised that more of your ancestors were in the Grand Forks, ND/East Grand Forks, MN area.For some reason, there was a very large migration of folks from the Mono/Simcoe area on ONT to that region.A gentleman with whom I've corresponded over the years has studied this for years.That migration might simply have been a case of families following families to the same area, but it is curious.
In your most recent message, you stated that William was born in 1802, but the LDS extracted church records give 1804.Was "1802" a typo?Also, in your July 12 message where you listed Henry's children, you ommited James, born 1806.Also, we know from those church records that Henry and Susanna Massey had William and James and my anecdotal information leads to Sussanah who married William Neil.However, what data do you have that leads you to conclude include William, Susanna and Margaret as Henry's children.Is there a census record or some other source?I'm not doubting your work, I'm just curious!
As for when William moved from Ireland to Ontario, I don't know if there will be immigration records, although there is one clue.William and Eleanor had 12 children.The oldest was Margaret (married William Lemmay) and she was born October 07, 1837 in the Toronto area.Thus, William moved after his birth in IRE on January 17, 1804 and before Margaret was born.
I also found a James McClinchy in the 1851 census for Etobicoke in York County, born circa 1808 with a wife and 6 children.This might be James, but the census states the first three children were born in IRE, which means this James immigrated between 1841-1843.This might make sense as I'm unsure if William's wife, Eleanor McFarland was born in IRE or New York state.
At Ancestry.com, I did find a listing for William's death: died 28 March 1878 in Mono, age 75, born in IRE and the informant was James McClinchy, a farmer in Mono.I suspect James is William's son.If so, here is James' obituary from the "Grand Forks Herald" newspaper dated April 06, 1913, "James McClinchy died yesterday at the home of his sister, Mrs. S.L. (Elizabeth Jane) Knapp.Deceased had been sick for some time and his condition took a turn for the worse several days ago.Mr. McClinchy was born in Ontario sixty-seven years ago and came to Minnesota thirty-seven years ago.He came immediately to East Grand Forks, settling on a farm eight miles north of here.He resided there until six years ago, when he built a home in East Grand Forks and moved his family to the city.Surviving him are a brother, Mathew, of Chicago, a daughter, Mrs. William Brown of Shelbrooke, Sask., and two sisters, Mrs. S.L. Knapp and Mrs. William Lammy, both of East Grand Forks.There are three other sisters, two of whom live in Ontario and one in Michigan.The funeral will be held at 2 o'clock Tuesday from the Mendenhall Memorial Presbyterian Church."(NOTE: Brother Mathew later moved to East Grand Forks and died there in 1928.)
Finally, in the Canadian Geneaology Index I found reference to a William McClinchy, year 1858, Simcoe County, in "South of Sodom: The History of South Norwich."Norwich is quite some distance from Simcoe County, so I don't know why this reference exists.I did call the Norwich Library and they checked the book.The listing references to pages 82 and 270 and, as luck would have it, William isn't mentioned on either of those pages!The library is continuing to check.