You could start using the free search tool at: https://familysearch.org/
And look for some of his descendants in later census – up to 1940 – and try to find names and locations.
Then try whitepages.com or other directories to look further or look for death certs to see if there are descendants listed there. Examples below for dau Mary Josephine Quinn Hicks.
United States Census, 1910
Citing this Record "United States Census, 1910," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MPPK-31Y
self Silvanus J Quinn M 73y Georgia
wife Mary L Quinn F 58y Virginia
son Silvanus B Quinn M 28y Virginia
dau Mattie D Quinn F 24y Virginia
dau Minnie M Quinn F 18y Virginia
dau Mary Quinn Hicks F 40y Virginia
James R Hicks M 40y Virginia
Des Val Q Hicks M 12y Virginia
1940 Upper Ward, Fredericksburg, Fredericksburg City, Fredericksburg City, VA
Citing this Record "United States Census, 1940," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/VR15-1C7
head Duval Hicks M 42 Virginia
wife Helen Hicks F 36 Virginia
son Duval Hicks M 20 Virginia
dau Dorothy Hicks F 14 Virginia
son James Hicks M 12 Virginia
father James R Hicks M 71 Virginia