Section 9. Any person interested in a will which has been proved and allowed in any other of the United States or in a foreign country according to the laws of such state or country, or in a will which, by the laws of the state or country in which it was made, is valid without probate, may produce to the probate and family court in any county where there is any property, real or personal, on which such will may operate, a copy of such will and the probate thereof, duly authenticated, or if such will is valid without probate as aforesaid, a copy of the will or of the official record thereof duly authenticated by the proper official having custody of such will or record in such state or country together with an affidavit, in each case, by the petitioner or other person having knowledge of the facts, stating the names and residences of the known heirs and the next of kin of the testator living at his death and their relationship to the testator. The court shall thereupon assign a time and place for hearing and cause notice thereof to be given to all persons interested by publication at such times and in such newspapers as the court orders, said publication to be thirty days at least before the time assigned for hearing.