No person other than a spouse, relative by blood to the fourth degree, parent-in-law, child-in-law, stepparent, stepchild, or child by legal adoption of the member, or one who is dependent upon the member or one who has an insurable interest in the life of the member as described in § 38.2-301, shall be named a beneficiary of the member’s certificate. Within the above limitations, each member shall have the right to designate his beneficiary and to change his beneficiary, upon due notice to the society. If the beneficiary is not living or if no allowable beneficiary has been designated, any proceeds otherwise payable shall be payable to the member’s estate.