I got the death certificates today for Theodore and also for Mary Ann DeForest. I did not have the maiden name for Mary Ann's mother before,it is hard to read but I think it might be LaSchuer,her father's name was John Palmer.
Mary Ann's birthdate was Jan 15, 1827,she died Jan 31, 1908. Theodore's birthdate was March 9,1850 and he died July 26, 1917.
Listed on the 1860 census from Unadilla,NY are Mason;Mary Ann; Theodore bd 1850;John bd ?;Angelia 1847;Nella bd 1860 and Emory bd 1853. Nella lived with Angelia and H P Weaver in Kane, PA in 1880, but I dont find her after that. Emory may have died in 1899 and is buried in Rogers Hollow Cemetery in Otsego County, NY--there is an Emory buried there next to Mason, but there are no bd or death dates listed. Hope this helps you.