[Robert] and his wife [Marie] went hiking with their daughter [Lizzie]. [Lizzie]'s brother [Mario] does n't like hiking and stayed home. [Louis] ran over to see his uncle [Mario].
('Marie', 'Louis')
[Robert] and his wife [Marie] went hiking with their daughter [Lizzie]. [Lizzie]'s brother [Mario] does n't like hiking and stayed home. [Louis] ran over to see his uncle [Mario].
[{('Marie', 'brother', 'Louis'): [('Marie', 'daughter', 'Lizzie'), ('Lizzie', 'uncle', 'Louis')]}, {('Lizzie', 'uncle', 'Louis'): [('Lizzie', 'father', 'Robert'), ('Robert', 'brother', 'Louis')]}, {('Robert', 'brother', 'Louis'): [('Robert', 'son', 'Mario'), ('Mario', 'uncle', 'Louis')]}]
['daughter', 'father', 'son', 'uncle']