 After watching the latest McBain film, Grampa suffers a mild heart attack. Thinking he might die, he is prompted to confess a long-hidden secret: Homer has a half-brother. Grampa explains that he met a carnival prostitute before marrying Homer's mother, and they had a son that they left at the Shelbyville Orphanage. Determined to find his brother, Homer and his family go to the orphanage and find out that Grampa's love child was adopted by a Mr. and Mrs. Powell and named Herbert.
