Question: who plays stacey's mum in gavin and stacey
[{'answer': 'Melanie Walters', 'provenance': [{'wikipedia_id': '25831483', 'title': 'List of Gavin & Stacey characters', 'start_paragraph_id': 1, 'start_character': 604, 'end_paragraph_id': 1, 'end_character': 619, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '25831483', 'title': 'List of Gavin & Stacey characters', 'start_paragraph_id': 11, 'start_character': 0, 'end_paragraph_id': 11, 'end_character': 603, 'bleu_score': 0.8284879702295591, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7487120203418321135}, 'section': 'Section::::Characters.:Main characters.\n'}]}, {'provenance': [{'wikipedia_id': '25831483', 'title': 'List of Gavin & Stacey characters', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 838, 'bleu_score': 0.9860618656782161, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7487120203418321135}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '25831483', 'title': 'List of Gavin & Stacey characters', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': [". During the first two series Gavin lives with his parents Mick (Larry Lamb) and Pam (Alison Steadman) but in the third series he has moved, with Stacey, to Barry and lives with Stacey's mum.", 'as moved, with Stacey, to Barry and lives with Stacey\'s mum. He has a best friend Neil "Smithy" Smith (James Corden). For most of the episodes Stacey lives in Barry with her mum Gwen (Melanie Walters), with an extended family of Uncle Bryn (Rob Brydon) across the street, and best friend Vanessa Shanessa "Nessa" Jenkins (Ruth Jones), but for a short', 'For most of the episodes Stacey lives in Barry with her mum Gwen (Melanie Walters)']}}]}]