The Family Secret involves wealthy Gladys Hullette and her poverty-stricken beau Edward Earle. To avoid incurring her father's wrath, Hullette marries Earle in a secret ceremony. When Hullette' child is born, papa throws her out of the house. Year pass: Earle, sneaking into his father-in-law's home to visit his child, is arrested as a burglar. It is up to the daughter-played by perennial "little Miss Fixit" Baby Peggy Montgomery--to straighten things out. Based on Frances Hodgson Burnett's hoary old kiddie story Editha's Burglar, The Family Secret is handled with wit and nuance by director William A. Seiter.