Found a C. D. March (Marsh) in Hazard, Perry County, KY in 1930. It really comes close to your father's family.

C. D. March 42
Athel (Gethel/Cethel)? 34
Walter, 14
Helen 12
Billie, 6.

So that may support the death record I found for him that read he died in Hazard, Perry Co., KY.

Can't seem to find much about your father or George but I am still searching.