Question: who are the only two families that have had three generations of oscar winners
[{'answer': 'Coppola', 'provenance': [{'wikipedia_id': '26019686', 'title': 'List of Academy Award-winning families', 'start_paragraph_id': 6, 'start_character': 4, 'end_paragraph_id': 6, 'end_character': 11, 'bleu_score': 1.0, 'section': 'Section::::Extended family.\n'}]}, {'answer': 'Farrow', 'provenance': [{'wikipedia_id': '26019686', 'title': 'List of Academy Award-winning families', 'start_paragraph_id': 7, 'start_character': 113, 'end_paragraph_id': 7, 'end_character': 119, 'bleu_score': 1.0, 'section': 'Section::::Extended family.\n'}]}]