Not related! Are you certain there are descendants of John Floyd Berry and Pearl Fountain Cook? The census indicate the couple only had two sons: John Floyd Berry (1 Aug 1899 - 24 Aug 1969) and Clifton Montgomery Berry (24 Jan 1902 - 12 Feb 1965). John, a rancher, died in Callahan County. His wife Thelma was the certificate's informant. Clifton, a pharmacist, died in Haskell County. His wife Mildred was the informant. There are no births listed on the registry for either couple. Perhaps you can obtain their obits which might reveal additional info on the families?