This may be your great grandparents marriage - I found it on
Michigan marriages in pilot.familysearch.org
Hugh
Butler, 21y, b.
Wexford Co, MI, farmer, s/o Frank
Butler & Edith
Covey, married on 13 May 1916 in Cadillac,
Wexford,
Michigan to Nina Amy, 19y b.
Wexford Co, MI, daughter of John C.(last name not showing) and Catherine
Dahmer. Married by Pres. Paster A. W. Johnstone - Witnesses: Clarence
Clark & Wayne
ButlerFrank E. Butler & Edith E. Covey's 1889
Wexford county marriage is also on the above website and names their parents.
There is a
Wexford county marriage in 1887 for a John C. Almy & Katie
Dolman that could be the parents of Nina - some census searches could provide the needed information on this.
Use pilot.familysearch.org for
Michigan marriages from 1868-1925 - it's fantastic....you will see the image of the original document.