Looking for William Phillips and Mary Knight S Family Lineage

Dona Belle Phillips Chaffin is my grandmother and I am looking for info on her ancestors.

Dona Belle Phillips B. 4-23-1903 Coalhill, Johnson County, Arkansas.

Dona's father, William Henry Phillips Born Alabama died in Madera,CA
Dona's mother, Mary E. Knight

Married Grover Cleveland Chaffin (B. 3-19-1902) on 12-6-1920 in Coalhill, Johnson County, Arkansas

Thank You!