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A confused Ritchie (Larry Mathews) stops Rob (Dick Van Dyke) and Laura (Mary Tyler Moore) cold during breakfast one morning with a big question: Why is Ritchie's middle name "Rosebud"? In answer, Rob and Laura flash back to a family gathering at the Petrie home a few months before Ritchie's birth, where virtually every one of their relatives was throwing out suggestions as to the best name for the new arrival. Without giving away the episode's punch line, it should be noted that among the guests are Rob's father Sam (J. Pat O'Malley) and the formidable Grandfather Petrie (Cyril Delevanti), who favors the name "Ulysses David."