Indiana Code Title 32. Property § 32-24-2-9

Sec. 9. (a) If a person having an interest in property affected by the proceedings is mentally incompetent or less than eighteen (18) years of age, the works board shall certify that fact to the municipality's attorney.

(b) The municipality's attorney shall apply to the proper court and secure the appointment of a guardian for the person less than eighteen (18) years of age or the mentally incompetent person.  The works board shall give notice to the guardian, who shall appear and defend the interest of the protected person.  However, if the protected person already has a guardian, the notice shall be served on that guardian.  The requirements of notice to the guardian are the same as for other notices.

(c) If there is a defect in the proceedings with respect to at least one (1) interested person, the defect does not affect the proceedings except as it may concern the interest or property of those persons, and the defect does not affect any other person concerned.

(d) In case of a defect, supplementary proceedings of the same general character as those prescribed by this chapter may be initiated in order to correct the defect.