IN RE BILL (DECD.); BILL AND OTHERS v. BILL AND ANOTHER Practice and procedure—Originating summons—When to issue—Application by originating summons for determination of issues relating to estate of deceased—Affidavit in opposition filed by defendants—Some issues in plaintiffs' affidavit controverted by defendants' affidavit— Whether originating summons proper mode of commencing action in the circumstances.