The word is 'Yerno'
Buenas noches yerno.
Sister in law in Spanish is cunada.
In Spanish it means Son-in-law.
"son"
The Spanish translation of "my son" is "mi hijo."
the actual word is NUERA which means daughter in law in spanish and YERNO is son in law in spanish.
In spanish son is: hijo
Yerno~ Son-in-law Yerna~ Daugther-in-law
In Spanish, you say mother as "madre" and son as "hijo."
You can say "ellos son guapos".
You say, "Soy tu hijo."
son feos or ellos son feos