I'm not related but looked at some on-line records and found only one Minerva Cross b. 1/20/1869 to Henry McKeeby and Jane Reams in Berrien county MI, where they are in the 1870 census as McKebbie, Henry 40 and Jane 22, Minerva 1, they live next to Issiah Reams. If this is the same person you seek, she would of been over 100 yrs old in 1972, the year of death you mention. It would also mean that Jane Reams was married before she married Mr Elwell. There is a marriage record of Lorina Jane Reams to Henry McKeeby 9/8/1867 in Cass county MI, he was 29, she was 20. In the 1930 census Minerva Cross b. 1870 living with C. William Cross b. 1876 and Elba Eichler b. 1892. 1920 census in Van Buren county has Charles W Cross 41, Minerva 49, and Elba P Eichler, stepson to Charles, 28. There is a marriage record in Kalamazoo county of Elba P Eichler 30 to Luella Reames 16. He is the son of Platt Eichler and Minerva McKeeby. I forgot to make note of the year. I'll look it up again and post what I find.