I don't have any dates for Olive Twitchell Kelso, nor do I know where her family came from. Her son moved to Idaho, but the rest of her children stayed in Allegan Co., MI. She was most likely born ca. 1850. My grandmother remembers her being alive in the 1920s and possibly 1930s.
Next weekend I am going to the Archives to check the Allegan Co. book for any Twitchells. I have found a few in the South Haven area (Van Buren Co., just south of Allegan Co.). Hopefully I will find something!