How many children did Queen Elizabeth II have?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q9682', 'id': 0, 'label': 'Elizabeth II'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q2340171', 'id': 1, 'label': 'Star of the Republic of Indonesia'}, {'type': 'INTERNAL', 'name_': 'Q7327', 'id': 2, 'label': 'Yuri Gagarin'}, {'type': 'INTERNAL', 'name_': 'Q11946199', 'id': 3, 'label': 'Vyprávěj'}], 'links': [{'name_': 'P166', 'source': 2, 'target': 1, 'label': 'award received'}, {'name_': 'P161', 'source': 3, 'target': 0, 'label': 'cast member'}, {'name_': 'P161', 'source': 3, 'target': 2, 'label': 'cast member'}]}