His WWI draft card lists nearest relative Edith Miller - doesn't indicate wife vs. mother? There are many Clarence Miller WV marriages on familysearch.org but middle names don't appear to match.
World War I Draft Registration
Citing this Record: "United States World War I Draft Registration Cards, 1917-1918," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/K831-R2Z
Name: Clarence Allen Miller
Residence: Cabondale, WV
Draft Registration Aug. 24, 1918 Fayette County no 2, WV
White Male age 21
Birth: 07 Aug 1897 Birthplace: Carbondale, WV
Fathers Birthplace: KY
Nearest Relative: Edith Miller, Carbondale, WV
Employer: Kanawhat Hocking Coal & Coke Co. Carbondale
Nationality: United States
U S Census, 1900 Kanawha, WV
Citing this Record: "United States Census, 1900," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M9CG-3RQ
Head William T Miller M 46 Kentucky
Wife Eda A Miller F 43 Kentucky
Son Lafeatte C Miller M 16 Kentucky
Dau Myrtie E Miller F 14 Kentucky
Dau Martha A Miller F 12 Kentucky
Son William T Miller M 9 Kentucky
Son James F Miller M 5 West Virginia
Son Clarence A Miller M 3 West Virginia