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MOTHER-IN-LAW. In Latin socrus. The mother of one's wife, or of one's husband.

References in periodicals archive ?
Mother-in-laws can be your worst nightmare, but above all they just love their children - Hercule Chalmers, Wishaw.
Mother-in-laws think that their sons can do no wrong and they never listen to our side of the story
Hill claimed that he had been watching television when his estranged wife used her key to enter the house, and that his mother-in-law had brandished her handgun when he tried to call 911.