A foster parent: someone who raises a child who is not their biological child; commonly used in child welfare contexts.
福祉事務所で里親登録の説明を受けた。
I received an explanation about foster parent registration at the welfare office.
彼女は数年間、里親として二人の子どもを育てた。
She raised two children as a foster parent for several years.
里親制度についての講座に参加した。
I attended a course about the foster parent system.
(For pets) a caretaker or adopter who takes responsibility for an animal from a shelter.
猫の里親を探している友人がいる。
I have a friend who is looking for a foster home for a cat.
このシェルターでは里親希望者を面接してから譲渡する。
This shelter interviews prospective adopters before handing over animals.