If the right, title or interest of any grantee of any plot or of the right of interment therein has passed by succession to the heir or heirs at law of the grantee without distribution by order of court, the heir or heirs at law may remove the remains of persons interred in the plot. The affidavit of any heir at law setting out the facts of heirship shall be accepted by the cemetery authority as sufficient evidence of the fact of the transfer.