This comedy finds a family turned upside down by a new addition to the house. Hubert (Louis De Funes) and his wife (Claude-Gensac) are shocked to discover her grandfather has been found frozen in a block of ice at the South Pole. Scientists revive the man, who still appears to be 25 years old. Hubert is reluctant to take in the man until he learns he is extremely wealthy. Doctors keep the news of the man's fortune from him and swear Hubert to secrecy so the man won't suddenly die from the shock. Hubert is full of familial affection for his wife's grandfather, who is mistaken for Hubert's son. The grandfather ends up marrying the fiancee of Hubert's son. Although the premise for this story is amusing, it was used in the American television program "The Second Hundred Years" in 1967 and should hardly be considered original.
by Dan Pavlides synopsis