If any of the next of kin are minors, such notice may be served as provided by the Alabama Rules of Civil Procedure; and in addition to the service above provided for minors, the court must appoint a guardian ad litem who is disinterested and who shall be an attorney-at-law and who does not represent any party having an interest adverse to such minors; and notice shall issue to such guardian ad litem. Such guardian shall accept service and agree to represent the minors in the proof and probate of the will, and if he fail to accept service and agree to appear for the minors within 10 days after service, the court appoint another guardian ad litem, upon whom notice must be served, and he must agree to accept service and represent the minors as is provided in the first instance, and the will must not be probated until a guardian ad litem has agreed to accept the appointment and to represent the minors in the proof and probate of the will, which acceptance and agreement must be in writing and filed with the papers in the cause, and notice must be given to such guardian ad litem in all proceedings to contest the probate of the will.