No railroad company selling such interchangeable mileage books shall discontinue the use of local mileage but the use of interchangeable mileage books shall not be extended to the members of the purchaser's family unless such selling company shall so elect; if it is so extended such ticket shall be valid and good for the carriage over the lines of such railroad of the purchaser and the actual members of his family living with him at the time of purchase if the name of the person so entitled to use such ticket shall be furnished in writing to the railroad selling it by the purchaser at the time of the purchase and shall be inserted in the ticket.
S.C. Code § 58-17-1930