Ivy BUCK born 1802 in Nassau NY. Came to Whiteside County Illinois in 1830's with his brother, Duty Buck. He died in Whiteside County in 1875.
Jeremiah BUCK born 1799 (brother of Ivy and Duty). His daughter Deloria was born in Ellicottville NY in 1834. She later married Joseph B. Ostrander in 1852, and they moved to Marengo, McHenry County, Illinois.
Perhaps your Ephraim is sibling to ancestory of these three BUCK brothers?