The numbers and letters on your tire sidewall can tell you much more, like your load capacity, handling at different speeds, and traction abilities. He was the second of Benjamin and Catherine (ne Flickinger) Firestone's three sons; Benjamin had a son and a daughter by his first wife. Their children were: Anne Firestone, Martha Firestone, who married William Clay Ford, Sr.; and Harvey Samuel Firestone III, who died in Havana. They had four children: Elizabeth, Anne, Martha, and Harvey Samuel III. Connect to the World Family Tree to find out, Harvey Samuel Firestone, Idabelle Firestone (born Smith), l Allen Firestone, Leonard Kimball Firestone, Raymond Christy Firestone, Roger Stanley Firestone, Elizabeth Idabella Graham (born Firestone), Martha Parke Ford (born Firestone), Harvey Samuel Firestone,