How to Say "foster" in Spanish
The Spanish word for “foster” is “adoptivo” — A2 level. This is a very common word in everyday Spanish.

Examples
Él quiere mucho a sus padres adoptivos.
He loves his adoptive parents very much.
Tengo un hermano adoptivo que nació en China.
I have an adopted brother who was born in China.
La familia adoptiva recibió al bebé con mucha alegría.
The adoptive family welcomed the baby with a lot of joy.
Matching Gender and Number
This word must change to match the person it describes. Use 'adoptivo' for a boy, 'adoptiva' for a girl, and add an 's' for more than one person.
Where to put the word
In Spanish, you usually place this word after the person you are talking about, like 'padre adoptivo' instead of 'adoptive father'.
Adoptivo vs. Adoptado
Mistake: “Calling a parent 'padre adoptado'.”
Correction: Use 'adoptivo' for the parents. 'Adoptado' is only for the person who was brought into the family (the child).
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