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/koʊˈɪnlɔː/ · noun
(rare) A distant in-law: A relationship by marriage with a separation by three degrees (two people), compared to prototypical in-laws, where the separation is two/one. The separation may be two degrees of blood kin and one of marriage (addressing the mother of the husband of one's daughter), or one degree blood and two of marriage (addressing the brother-in-law of one's brother, or, similarly, addressing the wife of the brother of one's husband)..
My co-in-law and I took our granddaughter to the zoo. [= co-parent-in-law]
the co-in-law, or aŋayunġuq-nukaunġuq relationship, which involved people who married siblings [= co-sibling-in-law]
Use co-in-law when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Co-in-law means (rare) A distant in-law: A relationship by marriage with a separation by three degrees (two people), compared to prototypical in-laws, where the separation is two/one. The separation may be two degrees of blood kin and one of marriage (addressing the mother of the husband of one's daughter), or one degree blood and two of marriage (addressing the brother-in-law of one's brother, or, similarly, addressing the wife of the brother of one's husband)..
Common synonyms include co-affine.
The opposite depends on the specific sense.
My co-in-law and I took our granddaughter to the zoo. [= co-parent-in-law]
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