I believe that Alvin's mother was Sally (Sarah) Ann Ackerman Arnold. My wife is descended from her daughter by Nathan Arnold, Caroline (Carrie) Arnold. You will see her in the 1860 census for Urbane on the second page just above Alvin. Alvin had half-brothers Amasa, Henry, Reuban Morse, Willard Rueben and Alonzo Arnold and also another half=sister Elizabeth Arnold. I would be glad to share whatever information I have.