老家大宅住著老老頭與三個兒子，長子老良（黃百鳴）因忙於公事怠慢了老婆賢淑，賢淑心有不甘；次子老非（吳鎮宇）愛上了飛車女，因恐老父反對而頻出怪招；三子老恭（周星馳）因欠賭債過百萬而裝瘋扮傻，家中上下對其呵護有加。由於老恭舉止動靜均與小童無異，逐漸成為家人傾訴的對象…
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