How to Say "son-in-law" in Spanish
The Spanish word for “son-in-law” is “yerno” — A2 level. This is a very common word in everyday Spanish.

Examples
Mi yerno es médico y trabaja en el hospital central.
My son-in-law is a doctor and works at the central hospital.
Ellos quieren mucho a su yerno.
They love their son-in-law very much.
El yerno de mi vecina nos ayudó con la mudanza.
My neighbor's son-in-law helped us with the move.
Always Masculine
The word 'yerno' is always masculine because it specifically refers to a male husband. If you are talking about a daughter's wife or a son's wife, you use a completely different word: 'nuera'.
Avoid 'Yerna'
Mistake: “Using 'yerna' to mean daughter-in-law.”
Correction: The correct word is 'nuera'. Unlike many Spanish words that just change 'o' to 'a' for gender, family titles like this often use totally different words.
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