Question: who are the only 2 families that have had 3 generations of oscar winners
[{'answer': 'The Hustons', 'provenance': [{'wikipedia_id': '26019686', 'title': 'List of Academy Award-winning families', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 11, 'bleu_score': 1.0, 'section': 'Section::::Extended family.\n'}]}, {'answer': 'the Coppolas', 'provenance': [{'wikipedia_id': '26019686', 'title': 'List of Academy Award-winning families', 'start_paragraph_id': 7, 'start_character': 78, 'end_paragraph_id': 7, 'end_character': 90, 'bleu_score': 1.0, 'section': 'Section::::Extended family.\n'}]}, {'answer': 'Hustons', 'provenance': [{'wikipedia_id': '26019686', 'title': 'List of Academy Award-winning families', 'start_paragraph_id': 7, 'start_character': 4, 'end_paragraph_id': 7, 'end_character': 11, 'bleu_score': 1.0, 'section': 'Section::::Extended family.\n'}]}, {'answer': 'Coppolas', 'provenance': [{'wikipedia_id': '26019686', 'title': 'List of Academy Award-winning families', 'start_paragraph_id': 6, 'start_character': 4, 'end_paragraph_id': 6, 'end_character': 12, 'bleu_score': 1.0, 'section': 'Section::::Extended family.\n'}]}, {'answer': 'Farrow / Previn / Allens', 'provenance': [{'wikipedia_id': '26019686', 'title': 'List of Academy Award-winning families', 'start_paragraph_id': 7, 'start_character': 113, 'end_paragraph_id': 7, 'end_character': 134, 'bleu_score': 1.0, 'section': 'Section::::Extended family.\n'}]}, {'provenance': [{'wikipedia_id': '26019686', 'title': 'List of Academy Award-winning families', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15360816256043945891}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '26019686', 'title': 'List of Academy Award-winning families', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 133, 'bleu_score': 0.9067110266941041, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15360816256043945891}, 'section': 'Section::::Extended family.\n'}]}, {'provenance': [{'wikipedia_id': '26019686', 'title': 'List of Academy Award-winning families', 'section': 'Section::::Extended family.\n', 'start_paragraph_id': 7, 'end_paragraph_id': 7, 'meta': {'evidence_span': ['Coppolas', 'The Hustons were the first three generation family of winners. The others are the Coppolas and, technically, the Farrow/Previn/Allens.', 'The Hustons were the first three generation family of winners. The others are the Coppolas and, technically, the Farrow/Previn/Allens.']}}]}]