I believe this is your man, (coincidently, I just looked into his line today, then I saw your post!)
Frederick Waterman Fernald b. Sep 1810 d. 30 Apr 1855. He 1st married Harriet Rockwell Cate on 29 Dec 1834 and 2nd m. Mrs. Phebe (Abrams) Chamberlain on 19 Sep 1850.
Fred's line: 5. Daniel Fernald and Hannah Manson 4. Jonathan Fernald and Sarah Weeks 3. Ebenezer Fernald and Patience Mendum 2. William Fernald and Elizabeth Langdon 1. Renald Fernald and Joanna Warburton