son-in-law
SUN-in-law/ˈsʌnɪnˌlɔː/
Pluralsons-in-law
- 1The husband of one's child.
The farm passed to his son-in-law after the wedding.
Both sons-in-law came to the reunion with their families.
Note
A family word older than its hyphens: Middle English had sone in lawe, and the King James Bible of 1611 still prints sonne in law as three separate words. The modern plural attaches to the noun that carries the meaning, giving sons-in-law, because in-law only qualifies son. Son-in-laws turns up in casual speech, but in writing it reads as nonstandard.
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Origin
From Middle English "sone in lawe," equivalent to "son" combined with the suffix "-in-law."