Did you know there's someone else looking for Robert and Darce Hoag family? She writes:

Hoag, William
Author: Barbara Fleming Date: 31 Oct 2003 2:14 PM GMT
Classification: Query

I am looking for information regarding William Hoag, b. 1836 in England to Robert and Darce Celia Eavens. They came to New York and lived in Rochester, Monroe Co. between 1836 and 1839. They moved to Calhoun Co. between 1845 and 1848. Robert's other children were Elizabeth, b. Jan. 1836, Robert, b. 1839, NY, Christopher, b. 1841, NY, Joel, b. 1843, NY, Albert, b. 1845, NY, George, b. 1849, MI, John K., 1852, MI, and Frank Elmar, b. 1854, MI. Anyone having information to share, would be glad to share what I have found.

If you type in Hoag in the Search box (top, left), select Calhoun Board, then click GO!, you'll get several messages and this is one of them. You might want to post a reply or email her directly.
Good luck!