Question: who played uncle charlie on my 3 sons
[{'answer': 'William Demarest', 'provenance': [{'wikipedia_id': '174002', 'title': 'My Three Sons', 'start_paragraph_id': 2, 'start_character': 226, 'end_paragraph_id': 2, 'end_character': 242, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '174002', 'title': 'My Three Sons', 'start_paragraph_id': 23, 'start_character': 0, 'end_paragraph_id': 23, 'end_character': 83, 'bleu_score': 0.676778111654288, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3100781340593466872}, 'section': 'Section::::Cast.:Main.\n'}]}]