[George] bought a dress for his daughter [April]. [John] went to the park with his father, [George].
('John', 'April')
[John] went to the park with his father, [George]. [George] bought a dress for his daughter [April].
[{('John', 'sister', 'April'): [('John', 'father', 'George'), ('George', 'daughter', 'April')]}]
['father', 'daughter']