Question: what is the relation between dhan ke devta kuber and ravan
[{'answer': 'half - brother', 'provenance': [{'wikipedia_id': '100325', 'title': 'Kubera', 'start_paragraph_id': 2, 'start_character': 244, 'end_paragraph_id': 2, 'end_character': 263, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '100325', 'title': 'Kubera', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 415, 'bleu_score': 0.8729718005443661, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16203662866702022584}, 'section': 'Section::::Abstract.'}]}]