Indiana Code Title 29. Probate § 29-1-1-20

Sec. 20.  (a) In a proceeding involving estates of decedents or trusts, or in judicially supervised settlements, persons are bound by orders binding others in the following cases:

(b) At any point in a proceeding, a court may appoint a guardian ad litem to represent the interest of a minor, an incapacitated, unborn, or unascertained person, or a person whose identity or address is unknown, if the court determines that representation of the interest otherwise would be inadequate.  If not precluded by conflict of interests, a guardian ad litem may be appointed to represent several persons or interests.  The court shall set out its reasons for appointing a guardian ad litem as a part of the record of the proceeding.  Any guardian of the person or estate of the person having an interest may be appointed as a guardian ad litem.

(c) The compensation of a guardian or guardian ad litem and the guardian's expenses including attorney's fees for services rendered in any proceeding under this article may be allowed in such amount and ordered paid either out of the entire estate involved as an expense of administration, or out of the protected person's interest therein as the court in its discretion shall determine.

(d) Any adjudication involving the interests of persons considered represented under this section shall be lawful and binding upon all interested persons, whether born or unborn, whether notified or not notified, and whether represented or not, if the interested persons are of the same class or have interests similar to the predominant interests of any person notified or represented.