How many Weasley children are there?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q716534', 'id': 0, 'label': 'Weasley family'}, {'type': 'INTERNAL', 'name_': 'Q3174865', 'id': 1, 'label': 'Bill Weasley'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q3430858', 'id': 2, 'label': 'Charlie Weasley'}], 'links': [{'name_': 'P463', 'source': 1, 'target': 0, 'label': 'member of'}, {'name_': 'P3373', 'source': 1, 'target': 2, 'label': 'sibling'}]}