Question: who plays cora's brother on downton abbey
[{'answer': 'Paul Giamatti', 'provenance': [{'wikipedia_id': '33907335', 'title': 'List of Downton Abbey characters', 'start_paragraph_id': 86, 'start_character': 27, 'end_paragraph_id': 86, 'end_character': 40, 'bleu_score': 1.0, 'section': 'Section::::The Crawley Family.:Harold Levinson.\n'}]}]