[Robert] went to the movies with his son [Mario]. [Robert]'s wife [Marie] stayed home to cook dinner. [Lizzie] went shopping at the mall with her mother [Marie] [Mario] could n't wait to introduce his new son to his uncle, [Louis].
('Lizzie', 'Louis')
[Lizzie] went shopping at the mall with her mother [Marie] [Robert] went to the movies with his son [Mario]. [Robert]'s wife [Marie] stayed home to cook dinner. [Mario] could n't wait to introduce his new son to his uncle, [Louis].
[{('Lizzie', 'uncle', 'Louis'): [('Lizzie', 'mother', 'Marie'), ('Marie', 'brother', 'Louis')]}, {('Marie', 'brother', 'Louis'): [('Marie', 'son', 'Mario'), ('Mario', 'uncle', 'Louis')]}, {('Marie', 'son', 'Mario'): [('Marie', 'husband', 'Robert'), ('Robert', 'son', 'Mario')]}]
['mother', 'husband', 'son', 'uncle']