A legal guardian — a person (typically a parent) who has the legal rights and duties to care for, educate, and represent a minor child.
パスポートを申請するには親権者の同意が必要だ。
A guardian's consent is required to apply for a passport.
離婚後、どちらが親権者になるかで話し合いが続いた。
After the divorce, discussions continued over who would become the child's guardian.
学校からの通知は親権者宛てに送られた。
The school's notice was sent to the guardian.