I too am looking for a Delaware COOK. She's Prudence, born about 1786 DE. As a reconstruction I think she may have been widowed some time 18-teens, with children. Here's why:
The first census I found her family is 1820 Catharine, Tioga County, NY. (now Schuyler County). They later lived 1830-on at Veteran twp, Tioga (later Chemung) Co NY. She was by then married with John McKINNEY b. about 1798 NY. That 1820 census showed them:
1820 CATHARINE, TIOGA CO., NY CENSUS
McKINGEY, John 3 boys under 10, a male 26-45, 2 females under 10, one 10-16, a female 26-45. (He might've been 26 barely or fudged on his age? Family lore says Pru's older than he.)
Now remember, John's all of 21-22 that year - 6 children, and one's aged 10-16 would be quite a feat. But Prudence is about 33-34. That's why I hypothesize he married a widow and readymade family.
Prudence and their known children consistently claim her birth state as DE.
At Veteran she consistently lived next door to surname MILSPAUGH (MILLSPAUGH, MILSPAW). I'm guessing that either that was her child's surname or that a daughter married into that family, but in truth I don't know any such thing.
Nor do I know for sure yet but suspect that John McKINNEY's from Orange Co, NY, up the Delaware River. And what would take Pru up the river, say in the years 1800-18teens. I'd like to know more about historical/political river traffic those 2 decades.
A side note, the known children's given names were John, Augustus, Alice, should those names fit family patterns.
Another side note, if my COOK family moved upriver from DE before Prudence married, here are the early ones at Orange County NY (most of whom are probably German from Ulster Co, NY).
1790 has William COOK at New Cornwall.
1800 has Henry & William COCK (KOCH ?), David, Thomas, John, George & William COOK .
1810 has COCK Charles Henry Edmund & Jacob; and COOK Thomas, Job, Stephen, George & William.
And most of all, can you or any reader place my COOK family?