Beethoven's 4th
The family is pleasantly surprised and puzzled when Beethoven suddenly becomes obedient. Turns out it's a prince and the pauper scenario, with the real Beethoven now living with a pompous rich family.
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About
Beethoven's 4th (2001) is a family movie. Starring Judge Reinhold, Julia Sweeney, Joe Pichler. Rated 5.3/10 on TMDB. Watch it online free on ZapFlix.