Ten days' prior notice of the motion under the preceding section shall be given to the grantor of the security trust, his heirs, devisees or personal representatives, to the trustee or trustees named in the security trust, and to the person appearing by such security trust or by a recorded assignment thereof to be the party secured or his personal representatives. If any of the parties upon whom such notice is required to be served be under disability, the notice shall be served on his guardian or committee or, if he have none, the court shall appoint a discreet and competent attorney at law as guardian ad litem, upon whom notice may be served.