(a) No payment shall be made to (or on behalf of) more than one individual, on the basis of being a public safety officer's parent as his mother, or on that basis as his father. If more than one parent qualifies as the officer's mother, or as his father, payment shall be made to the one with whom the officer considered himself, as of the injury date, to have the closest relationship, except that any biological or legally adoptive parent whose parental rights have not been terminated as of the injury date shall be presumed rebuttably to be such one.

(b) Any amount payable with respect to a minor or incompetent shall be paid to his legal guardian, to be expended solely for the benefit of such minor or incompetent.