Question: when were the triplets born on this is us
[{'answer': '1980', 'provenance': [{'wikipedia_id': '50526957', 'title': 'This Is Us (TV series)', 'start_paragraph_id': 6, 'start_character': 343, 'end_paragraph_id': 6, 'end_character': 347, 'bleu_score': 1.0, 'section': 'Section::::Premise.\n'}]}, {'provenance': [{'wikipedia_id': '50526957', 'title': 'This Is Us (TV series)', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 657, 'bleu_score': 0.8666953010295091, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3663225977716313351}, 'section': 'Section::::Premise.\n'}]}]