As
parens patriae ("parent of the nation"), the British Crown has a duty to protect its subjects, and particularly those unable to look after themselves. In the
United Kingdom and other
Commonwealth realms, the monarch as
parens patriae is parent for all the children in their realms, who, if a judge so determines, can become wards of court. However, the
House of Lords, in the case of
Re F (Mental Patient: Sterilisation), held that the monarch has no
parens patriae jurisdiction with regard to mentally disabled adults. A
court may take responsibility for the legal protection of an incapacitated person (adult) as well as a minor, and the ward is known as a
ward of the court or a
ward of the state. In Australia, New Zealand, and the United States, the child is termed a
ward of the court. In Ireland and the United Kingdom, "the" is not used; the ward is thus termed a
ward of court. In Canada, the legal term is
permanent ward, except in Ontario, which uses the term
Crown ward. ==Foster care==