noun, plural fathers-in-law.
the father of one's husband or wife.

1350–1400; Middle English; see father, in, law1

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n , pl fathers-in-law
the father of one's wife or husband

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Fifteen years before the work began, her father-in-law tried to steal her
The science seems to be largely spot-on: getting a decent grade from even my
  nuclear physicist father-in-law.
She and my father-in-law got married almost fifty years ago.
My father-in-law, a thoughtful and gentle fellow, didn't say anything.
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