mother-in-law:

The mother of one's wife or husband .

QUOTE: The boss (Oscar Apfec) and Ambrose (W.C. Fields) The Man on the Flying Trapeze (1935):
-- The boss, Mr. Mallory: ' It must be hard to lose your mother-in-law .'
-- Ambrose Wolfinger: ' Yes, it is. Very hard. Almost impossible in fact .'

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