Roberta,
I was a bit excited after reading your post so I just checked my files for the Ewers, and found a few things that don't match up with my files. Maybe you have info that I don't have? Edwin Ewer, father of Euphronia/Eupremia, married a Polina Ann Sawyer - your records show a wife by the name of Mary Ann Yawger. Do you know if he married twice? Or perhaps a copy was hard to read? I have a clear census copy that I could probably scan for you...if he married twice, could you let me know? That would be great. Edwin's father was indeed Isaac born in 1785, but Isaac G was Edwin's brother (born 1813, and Edwin born 1810). The very first Thomas Ewer, born 1592 on your post, I have 1595 as his dob, taken from the Otis Papers. Mehitable Fish married the Isaac born 1785, and Lydia Ann married Isaac G born in 1813! Thanks for posting, and I would love to share more info with you - can't wait to hear back!
Niki