[Wesley] took his sister [David]'s son [Michael] to a baseball game and [Michael] was delighted that his grandfather [James] showed up.
('Wesley', 'James')
[Wesley] took his sister [David]'s son [Michael] to a baseball game and [Michael] was delighted that his grandfather [James] showed up.
[{('Wesley', 'father', 'James'): [('Wesley', 'sister', 'David'), ('David', 'father', 'James')]}, {('David', 'father', 'James'): [('David', 'son', 'Michael'), ('Michael', 'grandfather', 'James')]}]
['sister', 'son', 'grandfather']