I am searching Decatur County PLEAKs and PLAKEs also. I have in my file a Walter Estal PLEAK, b. 1877, d. 1955, buried at Mt. Aerie Cemetery, Sand Creek Twp., Decatur CO, IN. His wife was Gertrude Dundon (Surname Unknown), b. 1880, d. 1958. I wonder if this is not perhaps in your father's lineage (with a brother named Walter E. and from the same county.)
I have also a Harry Paul PLAKE, and a Harold Leroy PLAKE, and a contemporary correspondent, Tommy Logan PLAKE (all Hiram PLEAK / PLAKE descendants.)
In your searches in the cemeteries, have you run across PLAKEs? I am particularly looking for the graves of Mathias PLAKE aka PLEAK and wife Jane SMITH. The last place I find him living is in Decatur County. Mathias is the father of the aforementioned Hiram W. PLEAK / PLAKE, b. 1802 KY.
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Linda PLAKE SPARLIN