Hi Carol, You can contact with a descendant by finding the children in the death index and then by finding their obituaries. It was very difficult to find most of these (Hamilton was listed in the 1930 Census as older than Louise) children because their middle initials weren't listed and the Griffin surname is pretty common.
Bonnie married a Lamar Allen. She was the Griffin with the latest death that I could find. I'll send her obituary to you separately.
AFter you read her obituary, you can look up the survivor info in Spokeo.com or Zabasearch.com. Successful Searching!