Ind. Code § 29-1-1-12
(a) Unless waived and except as otherwise provided by law, all notices required by this article to be served upon any person shall be served as the court shall direct by rule or in a particular case, by:
(b) In all cases where service by publication is ordered but personal service or service by registered mail is not ordered, all persons directed by the provisions of this article, or by order of the court, to be notified, whose names and addresses are known or can by reasonable diligence be ascertained by the party charged with the duty of giving notice, shall in addition to the published notice required by order, be served by a written notice by United States first class postage prepaid mail at least fourteen (14) days prior to the date set for hearing in the notice.
Formerly: Acts 1953, c.112, s.112; Acts 1955, c.258, s.1; Acts 1961, c.50, s.2. As amended by Acts 1982, P.L.171, SEC.6; P.L.118-1997, SEC.8; P.L.95-2007, SEC.3; P.L.162-2022, SEC.2.