Question: when is it revealed that luke and leia are siblings
[{'answer': 'In Return of the Jedi', 'provenance': [{'wikipedia_id': '50784', 'title': 'Princess Leia', 'start_paragraph_id': 1, 'start_character': 613, 'end_paragraph_id': 1, 'end_character': 632, 'bleu_score': 0.668740304976422, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '50784', 'title': 'Princess Leia', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1216, 'bleu_score': 0.9271194378516191, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16837120705492963278}, 'section': 'Section::::Abstract.'}]}]