I was hoping to get some clues as to the Alden portrait, but am also happy to help when I can.
My aunt's home is in Turner, Maine and I believe his father Sylvester Jones built it. I went to the Turner town office today and found in the vital records: Gennette Alden Jones: born in Turner April 13, 1824, wife of Thomas Sheldon. Her father - Barnum, and mother - Betsey Sampson. Note: Pub. Oct. 11, 1851.
From "History of Town of Greene" Maine, which adjoins Turner, I found that Lot 241 was divided between Benjamin Alden (my ancestor)and J. Sampson. So I believe your Jennette most probably goes back to John Alden of the Mayflower.