How to Say "siblings" in Spanish
The Spanish word for “siblings” is “hermanos” — A1 level. This is a very common word in everyday Spanish.

Examples
¿Cuántos hermanos tienes?
How many siblings do you have?
Tengo dos hermanos: un chico y una chica.
I have two siblings: a boy and a girl.
Mis hermanos y yo vamos al cine esta noche.
My siblings and I are going to the movies tonight.
The 'One-Guy' Rule (Default Masculine)
In Spanish, if a group includes even one male, the whole group is described with the masculine form. So, one brother and ten sisters are still called 'hermanos'. This applies to many other nouns for people, too!
Over-explaining
Mistake: “Tengo un hermano y una hermana.”
Correction: Tengo dos hermanos. (While the first sentence isn't wrong, the second one is much more natural and common when just stating the total number of siblings.)
Related Translations
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