I am researching the Irwin line along with Bill Irwin. In the Markham Museum, I found the following information:
Thomas McQuay - purchased lot 10, con. 4, Markham Twp. in 18--? - Died Oct 12, 1867, age 73 years (buried Buttonville Cemetery) - married Sarah who died Nov. 23, 1876 age 76 (buried Buttonville Cemetery)
Children: *Robert *Andrew - born 1841, farmed across road from lot 10, con 4. *Stewart - 1829-1869 buried Brown's Corners Cemetery(farmed lot 10, concession 4) *Sarah Jane - died Oct. 13, 1962 age 17 (buried Buttonville Cemetery)
Children of Thomas and Sarah 1) Stewart McQuay (1829-1869)married Elizabeth Dunn on June 26, 1864 (born 1839) living with her sons per 1891 census Children a) James born 1868, married Edith Shuttleworth (child of James and Edith - Mike McQuay) b) Thomas born 1866 2) Andrew McQuay - born 1841, married Mary ? (Irwin) born 1847 Children - James b. 1868, George b. 1871, William b. 1873, Benjamin b. 1876, Homer b. 1879, Andrew b. 1886, Aurilla b. 1882, Norman b. 1889 (taken from 1891 census)
Note: 1881 census shows a Matilda McQuay age 44, single, liviing with Elizabeth and her sons Thomas and James.
The above information was taken from the Family File, the Buttonville and Brown's Corners Cemetery records as noted, and the 1881 and 1891 census. signed H. R. Terhune, June 30, 1992 (probably a researcher for the museum)
In the McQuay file was a rambling page about the farm andpeople living around the family farm. Mike McQuay had farmed the family farm. He was born June 24, 1910 and was the son of James and Edith Shuttleworth. The farm was sold in 1973.
I have more on Andrew's line. Bill has photos of Andrew and Mary Irwin and another of their son James.