I found this for you, seems Williams last name was spelled Niel on the 1880 census. Shows Cordelia and also shows William as son in law.


Household Record 1880 United States Census

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Household:

Name Relation Marital Status Gender Race Age Birthplace Occupation Father's Birthplace Mother's Birthplace
James H. DAME Self M Male W 46 KY Preacher VA TN
Sarah E. DAME Wife M Female W 35 KY Keeps House NC KY
Danl. S. DAME Son S Male W 11 KY Works On Farm KY KY
Melissa DAME Dau S Female W 9 KY KY KY
Rosa E. DAME Dau S Female W 7 KY KY KY
Adda D. DAME Dau S Female W 3 KY KY KY
Jeff D. DAME Son S Male W 11M KY KY KY
W. M. NIEL SonL M Male W 23 TN Works On Farm NC NC
Cordelia A. DAME Dau M Female W 14 KY At Home KY KY

Cordelias father is listed as being a preacher.

I also found this from the birth index so I am going to assume Bessies last name was Clayton
Kentucky Birth Index, 1911-1999
about James O Neal
Name: James O Neal
Date of Birth: 25 Sep 1918
County: Hopkins
Mother's Name: Bessie Clayton
Volume Number: 85
Certificate Number: 42085
Volume Year: 1918
Sorry couldnt find James Death Cert in KY, are you sure he died here?