Question: who plays elizabeth keen's grandfather on the blacklist
[{'answer': 'Brian Dennehy', 'provenance': [{'wikipedia_id': '44348411', 'title': 'List of The Blacklist characters', 'start_paragraph_id': 313, 'start_character': 12, 'end_paragraph_id': 313, 'end_character': 25, 'bleu_score': 1.0, 'section': 'Section::::Supporting characters.:Introduced in season three.\n'}]}, {'provenance': [{'wikipedia_id': '44348411', 'title': 'List of The Blacklist characters', 'start_paragraph_id': 313, 'start_character': 0, 'end_paragraph_id': 313, 'end_character': 686, 'bleu_score': 0.9726437923163631, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13464844290029512651}, 'section': 'Section::::Supporting characters.:Introduced in season three.\n'}]}]