The plot to which the graves are removed shall be one which is mutually agreeable between the governing body of the county or municipality and the relatives of the deceased persons. If a suitable plot cannot be agreed upon between the parties concerned the matter shall be finally determined by a board of three members which shall be convened within fifteen days after final disagreement on the new location of the plot. The board shall be appointed as follows: One member shall be appointed by the county or municipality, one member shall be appointed by the relatives, and a third member shall be selected by the two. The decision of the board shall be final.