Should Son in Law Be Hyphenated?

noun, plural sons-in-law.

How do you write son in law?

By using "in-laws" one would refer to their daughter/brother/etc./son-in-law's family. And the correct plural is "sons-in-law", "daughters-in-law" and so on.

Is son in law a compound noun?

Three types of compound word

When compound words have spaces between them they are called open compound nouns: child care, work day, and time saver. ... When compound words are joined by a hyphen they are called hyphenated compound words. well-respected (adjective), son-in-law (noun), and life-size (adjective).