Sec. 4. (a) An action to annul a voidable marriage under this chapter must be conducted in accordance with IC 31-15.
(b) If a court has authorized a guardian to file an action to annul a marriage on behalf of an incapacitated person under IC 29-3-9-12.2, the guardian may file an action to annul a marriage in the guardian's county of residence if the guardian has resided in that county for at least three (3) months immediately preceding the filing of the action.