guardianship

Definition from Nolo’s Plain-English Law Dictionary

A legal relationship created by a court between a guardian and a ward--either a minor child or an incapacitated adult (although the latter relationship is more commonly called a conservatorship). The guardian has a legal right and duty to care for the ward. This may involve making personal decisions on the ward's behalf, managing the ward's property, or both.

Definition provided by Nolo’s Plain-English Law Dictionary.