With the wide-awakeness of most normal youngsters, Sonny Jim soon notices the growing love affair between his Aunt Julia and Mr. Elder, daddy's bachelor friend, and he makes an awful break by shouting right out at dinner that "Mr. Elder is making love to Auntie." However, he understands how it is himself, when he falls a victim to the charms of four-year-old Ruth. He also learns that the course of true love is anything but smooth when he drops and breaks Ruth's doll. In a burst of tears, she tells him she will never, never speak to him again. Sonny is terribly depressed, especially when his deadliest rival, Eddy, usurps him in Ruth's affections. He talks it over very gravely with Mr. Elder, who tries to help him, but it does no good, Ruth passes them both with nose in air. Just in his darkest hour, Mother Dear comes to the rescue by buying a beautiful new doll, which Sonny presents to Ruth, after which everything is bright and happy again.
—Moving Picture World synopsis