In 1870 there is a John Corneil (56) - Canada)in Sanilac county. I think he is the father.
In 1880 there is a Gideon Corneil in Lexington, Sanilac, Michigan.
I think he is an older brother.
By 1880 Mary A. (see 1870 census) has either died or gets married.
Use these links below for searching -
US GENWEB SITEhttp://www.us-census.org/inventory/ftp://ftp.us-census.org/pub/usgenweb/census/mi/
SK Publications – State/County Census Recordshttp://www.skpub.com/genie/censuscd.html
1870 Michigan Census = (Free, indexed and searchable, actual census page)http://envoy.libofmich.lib.mi.us/1870_census/
1880 US Census – The Mormon Church Files LDS (Free, indexed and searchable)
Click on the SEARCH tab at top of page
Look for 1880 US Census on the left side of screenhttp://www.familysearch.org/Eng/default.asp
Michigan Genealogical Death Indexing System (Free and searchable)http://www.mdch.state.mi.us/PHA/OSR/gendisx/search2.htm
Jack & Marianne Dibean –
Marriage Index Links = FREE
Scroll down page and look for a link “Search the New Marriages”http://www.mifamilyhistory.org/dibeanindex/dibean_county.htm...