Question: who plays jack's mother on when calls the heart
[{'answer': 'Brooke Shields', 'provenance': [{'wikipedia_id': '41630866', 'title': 'When Calls the Heart', 'start_paragraph_id': 27, 'start_character': 12, 'end_paragraph_id': 27, 'end_character': 26, 'bleu_score': 1.0, 'section': 'Section::::Cast.:Recurring.\n'}]}, {'provenance': [{'wikipedia_id': '41630866', 'title': 'When Calls the Heart', 'start_paragraph_id': 27, 'start_character': 0, 'end_paragraph_id': 27, 'end_character': 48, 'bleu_score': 0.6147881529512641, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5446631895450988070}, 'section': 'Section::::Cast.:Recurring.\n'}]}]