Have you see this? Great photo of Harvey and a few of his children.
http://www.bryan-thorne.com/Genealogy/TERRY_harvey.htmThis site has his parents as Benjamin Jacob Terry & Polly (no dates). I am assuming this would be Benjamin Terry & Mary Polly Andress. This may just be a guess on the person's part but Benjamin & Polly were in Hillier Tp., PE Co., on the 1852 Census; unfortunately, Harvey, 21yrs old, was there also but listed separately, as you probably already know. A few people have trees for Benjamin & Polly but Harvey isn't listed as a child.