Fa·ther-in-law n.; pl. Fathers-in-law  The father of one's husband or wife; -- correlative to son-in-law and daughter-in-law.
  Note: ☞ A man who marries a woman having children already, is sometimes, though erroneously, called their father-in-law.
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  fathers-in-law
       See father-in-law
  father-in-law
       n : the father of your spouse
       [also: fathers-in-law (pl)]