Source 1: 1850 Allamakee Co. Iowa Census pg: 005 for James Gillett age 40, farmer, B: NY; eunice A. Gillett, wife, age 37, b: Conn.; Hossis gillett age 18, farmer, b: Ohio; Olive gillett 3, B: Wisconson;
The marriage to (3) wife Eunce probably took place in either New York or Wisconson; (The child Olive listed on the 1850 Allamakee, Iowa census was born in Wisconson;
Source 2. 1860 Hanover, Allamakee, Iowa Census pg: 180; James Gillett, farmer age 50 B: New York; Eunice Gillett age 48 B; Conn. Red or Bid (Name is Question) age 9 B: Iowa; Clary, age 2 B: Iowa;
IGI suggests Eunice is Eunice A. McPherson.