(1) If the owner is unable, by reason of infancy or other disability, to act for himself, the person legally competent to act on his behalf may exercise the powers conferred upon an owner by section 5.
     (2) In the case of village-property, the headman or other village-officer exercising powers of management over such property may exercise the powers conferred upon an owner by section 5.
     (3) Nothing in this section shall be deemed to empower any person not being of the same religion as the persons on whose behalf he is acting to make or execute an agreement relating to a protected monument which or any part of which is periodically used for the religious worship or observances of that religion.