Notice of petition for probate

§ 18–501. Notice of petition for probate (a) Upon the filing of a petition for probate of a will, the notice provided by this section and sections 18–502 and 18–503, shall be issued to each person who would be entitled to or interested in the estate of the testator if the will had not been executed, to appear in the Probate Court on a date named in the notice, if he has cause to show why the prayer of the petition should not be granted. (b) The notice may be by a citation in which the return date named is not earlier than 10 days after the filing of the petition. The United States marshal or deputy marshal shall serve the citation in the District of Columbia not less than 5 days before the return day named in the citation.