|1827 New York|
But the previous generation is going to be more difficult. Now that I know when his parents were born, I'm confident the baptism record I found earlier is his father's. His grandfather was also named Isaac, but I hesitate to label them Sr, Jr, III, IV, etc. because I don't know how many generations of Isaacs there were. His grandmother had a rather common name, Ann, and there were several Isaac Parkes in that area.
Three Isaac Parkes were married in the same parish the children were baptized in, within 5 years of each other: 1810, 1812, and 1815. The latter makes the most sense, as it was one year before their first child, and the bride is listed as Isabella. The names of the other two brides were nothing like Rebella. I haven't seen an image of the actual parish register yet, so it may actually say Rebella, and got indexed incorrectly. It wouldn't be the first time.
Now onto this Isaac's siblings and parents. I've found baptism records there for at least nine children whose parents were Isaac and Ann Parkes. The first was born in 1771, then a large gap until 1788 with two records, two more in 1791, one in 1793, and finally 1796 with three records, including Isaac. This must be at least two families, possibly three because of the spread. The only sibling of Isaac I know for sure is Sarah, born 1788, because she and her husband Joseph Haynes also immigrated to America, and a history book on Cambria county identifies Isaac as her brother.