Doris, you don't indicate what you are looking for!
My wife is descended from their son, William Stewart Gray (b. 1842).
Here is what I've got:
Peter Gray, a Scottish immigrant, was born in 1802 and arrived in Canada with his wife Jane and young children prior to 1840. It was at this time that Gray applied for Southeast Lot 29, a grant of 100 acres in Petersville, Queens County bounding Gagetown Road for which he paid 2 s. 6 p. per acre. In 1851, he applied for a further 100 acres adjoining his son John, and of which “Peter has improved about 20 acres and built a barn.”
His farm is described in detail in the 1871 Dominion of Canada Census. At 100 acres, fully one half was improved, while another ten acres were held in pasture. He grew mainly oats and buckwheat, which accounted for approximately 100 bushels and 80 bushels production per year, respectively. At the time of enumeration, Gray possessed 2 oxen, 2 cows, 2 cattle, 14 sheep and 2 swine. During the previous year, he reports to have killed 9 sheep and 1 swine, as well as having produced 50 pounds of butter, 60 pounds of wool and 60 yards of cloth.
Issue: 1. John 1827
2. William Stewart 1842
3. Margaret Ann
4. Emly 1851
There may be other children. I never really looked that closely at this family.
I hope this helps,