story: [William] likes to sing with his brother [Robert]. [Robert]'s sister [Cecilia] hates when they sing. [Cecilia] invited her mother [Nettie], her brother [William] and her daughter [Maria] over to watch the football game on Sunday.
clean_story: [Cecilia] invited her mother [Nettie], her brother [William] and her daughter [Maria] over to watch the football game on Sunday.
proof_state: [{('William', 'mother', 'Nettie'): [('William', 'sister', 'Cecilia'), ('Cecilia', 'mother', 'Nettie')]}, {('Cecilia', 'mother', 'Nettie'): [('Cecilia', 'daughter', 'Maria'), ('Maria', 'grandmother', 'Nettie')]}]