In the book the Kennedys-MacDiarmids-McDermids-Munros and other Glengarry-Stormont Pioneers by R.B. Campbell and Douglas McDermid, ISBN 0-919303-99-4 - on page 465 & 466 there is a piece on Nancy Munro & John Chisolm, but it does not list any children. Nancy is the descendant of David Munro & Nancy McKay. John & Nancy are buried in the Old St. Andrews West cemetery at St. Andrews, which is south of Cornwall.
The following is from St Andrews West Catholic Cemetery in the files of Alex Fraser
42 To the Memory of Nancy Munro wife of John Chisholm, daughter of David Munro, pioneer and Nancy McKay who settled on Lot 2, 8th Concession of Cornwall in 1789 - all U.E.L.
(Nancy Munro 1766 - 1839)
Sacred to the Memory of John Chisholm native of Scotland, died at his
residence on the North Branch June 1825 aged 76 yrs, - [son of Wm Chisholm 1 - 7th Cornwall Twp]
If you would like to borrow the above McDermid book on interlibrary loan go to http://www.glengarrycounty.com/TitlesLoan.html
Alex has donated over a hundred local books to the "The Mid-Continent Public Library" for interlibrary loan or you can try your local library.
Alex's book title page is http://www.glengarrycounty.com/awfrrbks.html
if you would like to look at it.
Hope this helps