"Osceola County Tombstone Inscriptions" lists Mahlon Williamson 1858-1937 and on same marker Elizabeth Williamson 1860-1942; and Joseph A. Williamson 1864-1926 all buried in Maple Hill Cemetery. Death certificates would probably be available from the county. (courthouse in Reed City.) Both Reed City and Evart newspapers are archived. I think the Osceola County Genealogy Society has people who would look up obituaries for a fee. If you are interested email me directly and I will send you contact information.