Two of the Gilbreth children also paid tribute to their mother in books about their family life. "Cheaper by the Dozen" (1948), a bestseller by Gilbreth's son, Frank Jr., and daughter, Ernestine, was made into a motion picture in 1950 starring Myrna Loy as Lillian and Clifton Webb as Frank. The book's sequel, "Belles on Their Toes" (1950), also written by Frank Jr. and Ernestine, was made into a motion picture sequel in 1952. Frank Jr. also paid tribute to his mother in "Time Out for Happiness" (1972).