Who is a person with a ‘legitimate’ interest as related to suits affecting children?”

This term is broadly construed to accommodate the best interest of the child. It includes, but is not limited to grandparents, stepparents, former stepparents, blood relatives and family members provided any such party has intervened in the suit or is otherwise properly before the court. A party with a legitimate interest shall not include any person whose parental rights have been involuntarily terminated by court order if the child has been legally adopted, or who has been convicted of rape or incest when the child who is the subject of the petition was conceived as a result of such violation.