He is the custodian of his relative's land.
As the trustee of the estate, the responsibility is heavy.
person in charge of a detainee; custodian of a person in custody
Used in legal or official contexts for someone responsible for a person who has been taken into custody, such as a guardian or supervising officer.
The police called the custodian of the minor.
The person in charge of the detained suspect came for a visit.