adoptive
Adoptive (adj) means Related by adoption rather than by birth. Example: “Her adoptive parents raised her from infancy.”
How to use adoptive
Learner’s notesIn plain EnglishDescribes a family relationship formed through adoption.
Use "adoptive" for the parents/family ("adoptive mother") and "adopted" for the child ("adopted son") — they aren't interchangeable.
Fill the gap
Can you complete this real example?
Her _____ parents raised her from infancy.
Etymology
From adopt + the adjective-forming suffix -ive.