[Robert]'s son, [Mario], went to the candy store. [Mario]'s brother, [Ronald], went with him. [Robert] and [Marie] celebrated their one year anniversary of marriage today. [Lizzie] does n't always get along with her brother [Ronald]. Sometimes they fight like siblings do.
('Marie', 'Lizzie')
[Robert] and [Marie] celebrated their one year anniversary of marriage today. [Robert]'s son, [Mario], went to the candy store. [Mario]'s brother, [Ronald], went with him. [Lizzie] does n't always get along with her brother [Ronald]. Sometimes they fight like siblings do.
[{('Marie', 'daughter', 'Lizzie'): [('Marie', 'husband', 'Robert'), ('Robert', 'daughter', 'Lizzie')]}, {('Robert', 'daughter', 'Lizzie'): [('Robert', 'son', 'Mario'), ('Mario', 'sister', 'Lizzie')]}, {('Mario', 'sister', 'Lizzie'): [('Mario', 'brother', 'Ronald'), ('Ronald', 'sister', 'Lizzie')]}]
['husband', 'son', 'brother', 'sister']