It's not clear that the individuals appearing in the 1930 and 1940 census are identical. The families are totally different. The 1940 guy is more plausible since he is living near his father. He was the "proprietor of a gas station".
Hidalgo County Births 1932 shows:
WILLIAMS, ROBERT DONALD..........25 SEP 1932 m
HELEN MARIE CARLSON..............ROBERT COY WILLIAMS
Hidalgo County Births 1934 shows:
Williams, Richard Lee..........3-15-1934 M
Helen Marie Carlson............Robert Coy Williams
This person was created through the import of JDS_09_17_10.ged on 09 February 2011.
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DNA Connections
It may be possible to confirm family relationships with Coy by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Coy: