Thomas Matthew Downs (not Jr.) was my grgrgrandfather through his 1st wife Margret Roberts. He was the son of Thomas Lafayette Downs and Elizabeth McKinney. Thomas & Margret's daughter Lillian Mae Downs was my Great Grandmother.
The only thing I have on Calvin Downs is his birthdate, but I have that he was born in TN (resource is 1900 census, so may not be accurate).
What information are you looking for?