user: You are a structured reasoning expert tasked with solving problems step by step. 
You first think about the reasoning process in the mind and then provide the answer. The reasoning process and answer should be enclosed within <think> </think> and <answer> </answer> tags, respectively, i.e., <think> reasoning process here </think> <answer> answer here </answer>. 
Given a question and the associated knowledge graph triplets (entity, relation, entity), you are asked to answer the question with these triplets and your own knowledge. 
You can break down the original question into several sub-questions and explore the given knowledge graph to solve them step-by-step. If there are multiple possible answers, choose one as the final answer. 
After thinking, when you finally reach a conclusion, clearly state the answer within <answer> </answer> tags, i.e., <answer> answer here </answer>. 
Question: Which actors played the parents of the Gotham Rogues Player #9 character? 
Knowledge Triplets: Film character, freebase.type_hints.included_types, Topic
Fictional Character, freebase.type_hints.included_types, Topic
Ben Roethlisberger, people.person.parents, Ida Jane Foust
Film character, type.type.expected_by, Killed by
Film character, freebase.type_profile.strict_included_types, Fictional Character
Film character, type.type.properties, Portrayed in films
Film character, freebase.type_profile.strict_included_types, Topic
Gotham Rogues Player #9, common.topic.notable_for, g.1ydnqckyc
m.0y7gvsf, film.performance.special_performance_type, Uncredited
Character, type.property.expected_type, Film character
m.0y7gvsf, film.performance.character, Gotham Rogues Player #9
Film character, type.type.expected_by, Character
Fictional Character, freebase.type_profile.published, Published
Character, owl#inverseOf, Portrayed in films
m.0y7gvsf, film.performance.actor, Ben Roethlisberger
Film character, type.type.domain, Film
Fictional Character, freebase.type_profile.strict_included_types, Topic
Gotham Rogues Player #9, film.film_character.portrayed_in_films, m.0y7gvsf
Film character, freebase.type_hints.included_types, Fictional Character
Fictional Character, freebase.type_profile.kind, Portrayal
Film character, type.type.expected_by, Other conquests
m.0y7gvsf, film.performance.actor, Ben Roethlisberger
Kenneth Todd Roethlisberger, people.person.children, Ben Roethlisberger
m.0y7gvsf, film.performance.film, The Dark Knight Rises
Ida Jane Foust, people.person.children, Ben Roethlisberger
Gotham Rogues Player #9, film.performance.character, m.0y7gvsf
Character, rdf-schema#range, Film character
Ben Roethlisberger, film.actor.film, m.0y7gvsf
Ida Jane Foust, people.person.gender, Female
Film character, freebase.type_profile.kind, Portrayal
Film character, type.type.properties, Portrayed in films (dubbed)
Topic, freebase.type_profile.kind, Portrayal
Film character, common.topic.article, m.02_96_z
Film, type.domain.types, Film character
Kenneth Todd Roethlisberger, people.person.gender, Male
Ben Roethlisberger, people.person.parents, Kenneth Todd Roethlisberger
Film character, type.type.expected_by, Character using Wham-O product
Ben Roethlisberger, people.person.children, Kenneth Todd Roethlisberger
Film character, freebase.type_profile.kind, Annotation
Gotham Rogues Player #9, common.topic.notable_types, Film character
Film character, freebase.type_profile.published, Published
Topic, freebase.type_profile.published, Published
Character, type.property.reverse_property, Portrayed in films
Ben Roethlisberger, people.person.parents, Ida Jane Foust

Answer: Ida Jane Foust
Kenneth Todd Roethlisberger