hijo
son, child
The everyday word for a son or child
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Hijo means son or, more generally, child.
hijo
son, child
A male child, or a child whose sex isn't specified.
Mi hijo tiene cinco añosMy son is five years old
Quieren tener un hijo el próximo añoThey want to have a child next year
son, dear (affectionate address)
Used affectionately to address someone you care about, much like calling someone "son" in English, even between people who aren't related.
Hijo, no te preocupes tantoSon, don't worry so much
¡Ay, hijo, qué susto me diste!Oh, dear, what a scare you gave me!
hijos
children, kids
The plural covers any group of children, whether all sons or sons and daughters mixed, since Spanish uses the masculine plural for mixed groups.
¿Tienen hijos?Do you have children?
Mis hijos ya están grandesMy kids are all grown up