Question: what episode does grandpa die in only fools and horses
[{'answer': "`` Strained Relations ''"}, {'provenance': [{'wikipedia_id': '950744', 'title': 'Grandad (Only Fools and Horses)', 'start_paragraph_id': 18, 'start_character': 0, 'end_paragraph_id': 18, 'end_character': 1231, 'bleu_score': 0.9911697618108691, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7120559268846022712}, 'section': 'Section::::In the programme.\n'}]}]