Yvonne Stevens, mother of George Stevens Jr., died May 27 in Hollywood of heart failure. She was 107.Stevens, the daughter of silent screen actress and producer Alice Howell, was a Mack Sennett Bathing Beauty, a bevy of girls who were featured in his slapstick comedies, and played small parts in films. In 1928 she met George Stevens, who was a cinematographer, and they were married two years later. The couple later divorced and Stevens died in in 1975. Among the survivors are three sons, including multihyphenate Stevens Jr., founder of the American Film Institute; one daughter; three grandchildren; and six great-grandchildren.