[Robert] took his son [Mario] to a baseball game on Monday. Later that night, he took his daughter [Lizzie] for ice cream. [Robert]'s mother [Shantel] made an apple pie for [Robert]'s son [Mario].
('Lizzie', 'Shantel')
[Robert] took his son [Mario] to a baseball game on Monday. Later that night, he took his daughter [Lizzie] for ice cream. [Robert]'s mother [Shantel] made an apple pie for [Robert]'s son [Mario].
[{('Lizzie', 'grandmother', 'Shantel'): [('Lizzie', 'brother', 'Mario'), ('Mario', 'grandmother', 'Shantel')]}, {('Mario', 'grandmother', 'Shantel'): [('Mario', 'father', 'Robert'), ('Robert', 'mother', 'Shantel')]}, {('Lizzie', 'brother', 'Mario'): [('Lizzie', 'father', 'Robert'), ('Robert', 'son', 'Mario')]}]
['father', 'son', 'father', 'mother']