I do have a subscription to Ancestry and didn't find him listed after 1930. I checked the new online 1940 census records for Barnwell and Williston and couldn't find him.

In familysearch.org, I found the Court Probate papers for his father's Will. It named his wife Mary and his son Ellie as heirs. Ellie didn't show up in the death records for 1915-1945. I was thrilled to receive Melvin's obit from a forum reader which mentions Mary and Ellie.

In 1920 neither Mary or Ellie show up in the Census records. Mary died in 1927 and Ellie pops up in the 1930 Census.

If your friend can provide any info, that would be great. I can certainly share any info that I have on the Hairs with her.