Question: who plays leroy jethro gibbs father on ncis
[{'answer': 'Ralph Waite', 'provenance': [{'wikipedia_id': '2127122', 'title': 'Ralph Waite', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 11, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2127122', 'title': 'Ralph Waite', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 502, 'bleu_score': 0.742836264742848, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10951986614255464841}, 'section': 'Section::::Abstract.'}]}]