[Harold]'s daughter, [Dorothy], went to the store. [Dorothy]'s daughter, [Rebecca], accompanied her. [Robert] took his daughter [Lizzie] to see her grandfather [Harold] after school yesterday.
('Robert', 'Rebecca')
[Robert] took his daughter [Lizzie] to see her grandfather [Harold] after school yesterday. [Harold]'s daughter, [Dorothy], went to the store. [Dorothy]'s daughter, [Rebecca], accompanied her.
[{('Robert', 'niece', 'Rebecca'): [('Robert', 'sister', 'Dorothy'), ('Dorothy', 'daughter', 'Rebecca')]}, {('Robert', 'sister', 'Dorothy'): [('Robert', 'father', 'Harold'), ('Harold', 'daughter', 'Dorothy')]}, {('Robert', 'father', 'Harold'): [('Robert', 'daughter', 'Lizzie'), ('Lizzie', 'grandfather', 'Harold')]}]
['daughter', 'grandfather', 'daughter', 'daughter']