[David] and her sister [Lynn] played golf together. [David] won easily. [Michael] wanted to stay with his mother [David] for the weekend, but she insisted that he visit his grandfather [James] instead.
('Lynn', 'James')
[David] and her sister [Lynn] played golf together. [David] won easily. [Michael] wanted to stay with his mother [David] for the weekend, but she insisted that he visit his grandfather [James] instead.
[{('Lynn', 'father', 'James'): [('Lynn', 'sister', 'David'), ('David', 'father', 'James')]}, {('David', 'father', 'James'): [('David', 'son', 'Michael'), ('Michael', 'grandfather', 'James')]}]
['sister', 'son', 'grandfather']