foster parent

/ˈfɔstər ˌpɛrənt/
noun
  1. A person who cares for and raises a child that is not their biological or legal adoptive child, usually through a formal arrangement with a government or agency.
    • Many foster-parents provide temporary care while the child's situation is being resolved.
    • Becoming a foster-parent requires training and a home inspection.
    • The foster-parent worked with the child's biological family to plan visits.