When a grave or memorial site is purchased, with it comes the right of interment – the right to decide who is buried there, and what kind of memorial they will have. The HRI is the person who holds this right. They are recorded by the cemetery trust at time of purchase, and are either the purchaser, or a person/people assigned by the purchaser.
SMCT can advise who the HRI is for a relative’s grave or memorial site if you are not sure.