One of four actress sisters, the others being Polly Ann Young, Georgiana Young and Loretta Young. Sally retired from the screen ca. 1939. Although this lovely, light brown-haired leading lady would wind up better known as one of Loretta Young's three acting sisters, Sally Blane nevertheless enjoyed a modest "B" film career during the late 20s and 30s. The resemblance to her "A" level sister was very strong -- the same graceful, elongated face and fawn-like, wide-set eyes. Unlike her sister, however, Sally lacked strong determination and …