The In-Laws on AllMovie

Dentist Sheldon Kornpett (Alan Arkin) is a respectable man. He has a daughter who is about to marry the son of a very suspicious character, Vince Ricardo (Peter Falk). They are practically relatives already, the wedding is so near. Certainly, Sheldon already despises Vince as if he were already a well-known relative. Nontheless, Vince calls on Sheldon and convinces him to go with him on a series of wild and hilarious adventures, claiming all the while that he is a CIA agent, and that what he is doing is in the national interest. Sheldon follows Vince to a South American country ruled by a very odd man, General Garcia (Richard Libertini), who talks to his hand (which talks back). It seems that the dictator is involved in a scheme to counterfeit and undermine U.S. currency.