The story
English has no single word for your child's spouse's parents. Yiddish has machatunim, and American Jewish English kept it, mostly for weddings and the seating plans that follow. Spanish has consuegros for the same people.
מחותּניםmakh-uh-TOO-nim[maxəˈtunim]
the parents of your child's spouse — your co-in-laws
Closest in English: in-laws, inlaws, co-in-laws. None of them covers it.
English has no single word for your child's spouse's parents. Yiddish has machatunim, and American Jewish English kept it, mostly for weddings and the seating plans that follow. Spanish has consuegros for the same people.
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