[Marie] and her sister [Dorothy] were at the library studying. [Lizzie], [Marie]'s daughter, started laughing, and [Lizzie] told her to be quiet. [Beverly] is a sister of [Robert]. [Lizzie] took her father [Robert] out for his birthday. They had a wonderful time.
('Dorothy', 'Beverly')
[Marie] and her sister [Dorothy] were at the library studying. [Lizzie], [Marie]'s daughter, started laughing, and [Lizzie] told her to be quiet. [Lizzie] took her father [Robert] out for his birthday. They had a wonderful time. [Beverly] is a sister of [Robert].
[{('Dorothy', 'sister', 'Beverly'): [('Dorothy', 'sister', 'Marie'), ('Marie', 'sister', 'Beverly')]}, {('Marie', 'sister', 'Beverly'): [('Marie', 'daughter', 'Lizzie'), ('Lizzie', 'aunt', 'Beverly')]}, {('Lizzie', 'aunt', 'Beverly'): [('Lizzie', 'father', 'Robert'), ('Robert', 'sister', 'Beverly')]}]
['sister', 'daughter', 'father', 'sister']