Question: when did the royal family change to windsor
[{'answer': 'in 1917', 'provenance': [{'wikipedia_id': '172905', 'title': 'House of Windsor', 'start_paragraph_id': 2, 'start_character': 97, 'end_paragraph_id': 2, 'end_character': 104, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '172905', 'title': 'House of Windsor', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 677, 'bleu_score': 0.91708531135182, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 135906552126150804}, 'section': 'Section::::Abstract.'}]}]