Lisa's 'mudder' (mother) pays a surprise visit to the Hooterville farm and promptly takes over as a three-week house guest.

Fred Ziffel finds out that Arnold may in line for a inheritance. Arnold has the ability to predict the weather with his tail, supposedely making him a direct discendant of Herman, a spokespig who could also do the same. All of Hooterville, including Lisa tries to get Oliver to take Arnold to Chicago to receive the pig's $20,000,000 inheritance.