If an interested person has a guardian or conservator of the estate who resides in this state, personal service on the guardian or conservator of any process, notice, or court order concerning a decedent’s estate is equivalent to service on the ward or conservatee, and it is the duty of the guardian or conservator to attend to the interests of the ward or conservatee in the matter. The guardian or conservator may appear for the ward or conservatee and waive any process, notice, or order to show cause that a person not under legal disability might waive.