[Harold] bought his daughter, [Dorothy], flowers. [Aaron] and his father [Antonio] were playing at bowling. [Harold], [Aaron] 'grandfather felt left out because he was n't invited and [Antonio]'s brother [Robert] felt the same way.
('Robert', 'Dorothy')
[Aaron] and his father [Antonio] were playing at bowling. [Harold], [Aaron] 'grandfather felt left out because he was n't invited and [Antonio]'s brother [Robert] felt the same way. [Harold] bought his daughter, [Dorothy], flowers.
[{('Robert', 'sister', 'Dorothy'): [('Robert', 'father', 'Harold'), ('Harold', 'daughter', 'Dorothy')]}, {('Robert', 'father', 'Harold'): [('Robert', 'brother', 'Antonio'), ('Antonio', 'father', 'Harold')]}, {('Antonio', 'father', 'Harold'): [('Antonio', 'son', 'Aaron'), ('Aaron', 'grandfather', 'Harold')]}]
['brother', 'son', 'grandfather', 'daughter']