"Es" and "son" mean "is" and "are" in Spanish.
Son in law is male related to you by marrying your daughter.
"is" plural version is "son"
It's the son-in-law.
How is my beloved son?
Usted(es) es/son (formal, singular/plural)) Tu eres (informal, singular) Vosotros sois (informal, plural)
"Quién es el hijo de tu abuelo" is Spanish for "Who is the son of your grandfather?"
"Si es, es" is Spanish for "If it is, it is". If you just mean "si es", that means "if it is". If you mean "Sí es" (with an accent on "Sí"), it means "Yes, it is".
Es - Is
That means, "He is your aunt's son." Sounds like an answer to "What is a cousin."
It means "what time." If it was actually "¿Qué hora es?" then it means "What time is it?"
es
Es la una. Son las..... Es la hora... El tiempo es...