There are 2 petitions in the collection called the Upper Canada Land Petitions. One in 1837, and one in 1841, which gives slightly different informations. There is no wife called Sarah, but Elizabeth.
Upper Canada Land Petitions of John Morey of Brantford,
UCLP Volume 365, Bundle M22, Petition 102, on microfilm reel C-2219, RG 1 L3,
http://www.collectionscanada.gc.ca/microform-digitization/00...Petition of John Morey, of the township of Brantford, in the Gore District
That 37 years ago, John Morey married Elizabeth a daughter of Sarah a Mohawk woman of the six Nations Indians. That twenty eight years ago, Your petitioner was prevailed upon by the Chiefs of the Six Nations to sell his possessions in Blenheim and remove on the Indian Lands under a promises made by the late Captain Joseph Brant at the request of the Indians in Counceil, that his said wife should have a lease from him for a farm at any place on the Grand River lands, that was not incumbered by other settlers. That your petitioners and his family then settled on the farm they now live on in the first concession of Brantford, but captain Brant died without executing the lease which was so promised to your petitioner’s wife. [.. And so on]
The second petition
Upper Canada Land Petitions of John Moray of Brantford, Brant County.
UCLP Volume366, Bundle M1, petition38, on microfilm reel C-2220. RG 1 L3, digitized online.
http://www.collectionscanada.gc.ca/microform-digitization/00...7 July 1841, John Morey, who signed his name, states that the land patent was issued to his wife Elizabeth Morey, who is now deceased. He also states that he has 8 children living, the eldest of which is about 40 years of age. The children are named: John, Susan, Silas, Hannah, Mary, Heraim, Catharine, and Isaac. He is asking for a patent issued in name of children. James Henderson wrote the petition for John Morey.
The petition is not recommended, the EC stated the land must be claimed with the Heir and Devisee Comm.
Note that one petitoin is indexed under MorAy and one under MorEy.
There is also a file in the Heir and Devisee Commission at the Archives of Ontario.