Hello Nadine, In the Oak Grove Cemetery book, are your Elbert & Mabel McPeak !!Oak Grove Cemetery is located on the west side of the city of Coldwater, Branch Co., MI.
McPeak, Elbert A.,b NE,d Coldwater 12 Mar 1911, age 28y 5m 15d, married, (Mabel McPeak), Lot 1237, Section 12, Volume 2-45.
McPeak, Mabel,d Coldwater1 Feb 1912, age 28, female, widowed, (Mrs. Charles Thompson, informant) Lot 1238, Section 12, Volume 2-48.
There are no other McPeak names in the book which covers the years 1831-1986. I also checked the Rural Cemeteries of Branch County book, and Bronson Cemetery, and Lakeview Cem. in Quincy, MI. and no other McPeak names were found. I hope this helps you. Mary Bickford in TX.