The latest Petticrew-Pettigrew DNA results I have are from May 2005, so I have not seen how your cousin's contribution relates to the rest.
I would not consider Robert Pettigrew's age of 67 in 1850 census to be rock solid.In the 1830 census he was slotted in the 1771-1780 group.So he might have been 70 or older in 1850, thus at least 18 in 1798.I don't know how old a man had to be for taxation then.
That he (or another Robert) was in Rostraver Twp in 1798 is illuminating.The next census entry shows there was a John in that same twp in 1810.He disappears thereafter from Rostraver Twp census.I am still trying to track him elsewhere.
1810 Rostraver Twp., Westmoreland Co. PA [Series m252, Roll 51, pg 237-44] John Pedegrue/Pedegare 10010|00100 1m <10, 1m 26-44, 1766-84, 1f 16-25,1785-94
Re the Jacob Pettigrew family bible record, do you know who Hannah Hilliard was?No age at death given unfortunately.
I saw your post giving details of Jacob's granddaughter Sarah marrying Aquilla Hilliard.West of Armstrong Co. is Butler Co. and in an 1883 Butler Co. history there is mention of Andrew Pettigrew whose second wife was Ella Hilliard.The short bio said Andrew's father (unnamed) was from Co. Down, Ireland, and settled on Brush Creek in Westmoreland Co., where he died.Because Robert Pettigrewhad a son named Andrew, I think there is a good chance that Robert and the Butler Co. Andrew were brothers, or at least relatives.Their ages were close enough for brothers or cousins.
Andrew's grandson, Andrew J. son of Samuel C., also married a Hilliard named Nancy.
That the elder Andrew's father settled on Brush Creek in Westmoreland Co. places him in the vicinity of N. Huntingdon Twp.I found the following where Brush Creek is mentioned:
"North Huntingdon Township: Europeans originally settled the community’s eastern and western landscape. The German settlement was on the east and the Scotch-Irish on the west. The land now known as Irwin geographically divided the settlements into two distinct areas. The Township of Huntingdon was founded on April 6, 1773. Huntingdon’s boundary began at the mouth of Brush Run where it empties into Brush Creek. The boundary went along Byerly’s Path to Braddock’s Road and then continued to the lines that marked the Townships of Mount Pleasant, Tyrone, and Pitt. Huntingdon was later divided into smaller Townships of North Huntingdon, East Huntingdon, and Sewickley.
The two waterways in North Huntingdon Township are Brush Creek and the Youghiogheny River, which flow in a northwesterly direction toward Allegheny County. "
Brush Creek also continues alongHempfield Twp.
It looks to me like there was an extended Pettigrew family group in Westmoreland, Armstrong, and Butler counties, and I am excited that this group may be related to the Dauphin Co. Pettycrews.This would be the first break to connect various PA Pettigrews and Petticrews.I am glad you posted your query.