Question: who played randalls father on this is us
[{'answer': 'Milo Ventimiglia', 'provenance': [{'wikipedia_id': '50526957', 'title': 'This Is Us (TV series)', 'start_paragraph_id': 1, 'start_character': 301, 'end_paragraph_id': 1, 'end_character': 317, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '50526957', 'title': 'This Is Us (TV series)', 'start_paragraph_id': 9, 'start_character': 12, 'end_paragraph_id': 9, 'end_character': 108, 'bleu_score': 0.612808133186403, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12459388603751711396}, 'section': 'Section::::Cast and characters.\n'}]}]