Alexander M. Thatcher of Massachusetts

I have been looking for the family of my great-great-grandfather Alexander M. Thatcher for a long time. He was born 18 July 1818. He married Huldah Bishop 14 Aug 1844 in Tyringham, Berkshire Co., MA. Alexander died from typhoid fever 13 Jan 1880 in the town of Great Barrington, Berkshire County, MA, and is buried in Greenlawn Cemetery, Housatonic in the same town. His death certificate said he was from Pennsylvania, but he is not known among Pennsylvania researchers. His marriage record said he was from Northampton. He wasn't in the Northampton records, but it seemed people living there came from along the Connecticut River or the eastern part of Massachusetts. So far I haven't found a fit for him there, either.

Huldah Bishop was born 21 Jan 1821 in Tyringham, the daughter of Bohan Bishop and Deborah Taylor. She worked in a paper mill in 1860. She became a member of the Methodist Church of Lee on 1 Sept 1892. She died of apoplexy 15 July 1896 in Tyringham.

Children:
Julia M. Thatcher, b. 7 July 1845, MA, d. 11 June 1855.
Eugene Stephen Thatcher b. 19 Aug 1848. He married Alice Cordelia Rewey, 6 Sept 1879, in Housatonic
Agnes Thatcher, b. July 1850.
Susan Thatcher, b. ca 1852.
Cora Leona b. 30 Sep 1858. She married Henry Franklin Winchell, b. 11 Aug 1857, Berkshire Co., MA, (son of John L. Winchell and Winifred O. Ashley).
Caroline Thatcher, b. 1 Sep 1863, Housatonic, MA.