(a) A minor shall appear by his father or mother with patria potestas or, in their defect, by his general guardian. A person of legal age or who has been emancipated and who has been declared incompetent by a court shall appear by his general guardian. However, the court may appoint a guardian ad litem for an infant or an incompetent person as it deems proper or as provided by law.(b) In the cases provided for in the last sentence of Rule 4.4(c) and in Rule 22.2, the court shall determine the party’s mental condition, and if deemed convenient and proper, the court shall appoint a guardian ad litem.
Puerto Rico Legal Code