Re: Egbert T Whitney 1812 Cairo New York
I found this information in the "1855 census of Greene county NY" This looks like the Mary Curtis Whitney you asked about:
Town of Cairo
CURTIS, Isaac, clock maker, 72 yrs, born CT, wife Betsy 62 yrs, born MA, ch: Harmon seaman 23 yrs, Adaline 21, Caroline HALL (married) 27 yrs, her ch: Carra 2 yrs, Willis 1 yr he born in CT., ch: Mary WHITNEY (Isaac's ch) 40 yrs, her ch: Adalade 9, Jennett 3 (both born in Ulster county)
Hope this helps.