How many children did Cleopatra have?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'INTERNAL', 'name_': 'Q351538', 'id': 0, 'label': 'Alexander Helios'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q40058', 'id': 1, 'label': 'Cleopatra Selene II'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q635', 'id': 2, 'label': 'Cleopatra'}], 'links': [{'name_': 'P3373', 'source': 0, 'target': 1, 'label': 'sibling'}, {'name_': 'P25', 'source': 0, 'target': 2, 'label': 'mother'}]}