Ambrose C. Park (Red Skelton), left on a park bench as an infant with an impulsive need to find his parents, is an assistant to a diamond cutter. Shyster lawyer Remlick (James Whitmore), in a strategy to get a fabulous uncut diamond through Ambrose, arranges for Emmily Drummon (Dorothy Stickney), Duke Fargoh (George Mathews) and Maggie Drummon (Cara Williams)to pose as Ambrose's long-lost parents and sister. The diamond, through many comic situations, is acquired and the gang is going to have Ambrose cut the diamond, and relieve him of the two stones and also his parental illusions at the same time. But Maggie, who has no taste for the deception, tips Ambrose off and a wild chase ensues. At the end, Ambrose is very happy as he can now marry his "sister."