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

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
References in periodicals archive ?
Many of our readers have had run-ins with their mothers-in-law but, for others, she's a close friend that they can turn to for advice.My mother-in-law is my second mum.
I listen to my mother-in-law's advice more than even my wife does and certainly more than my own mother's advice.
The amount of stress and arguments caused by mother-in-law is unbelievable.