[Lena]'s son [Chris] and brother [Joshua] came to her birthday party last weekend. [James] took his grandson [Chris] to the store to buy some new books.
('Joshua', 'James')
[Lena]'s son [Chris] and brother [Joshua] came to her birthday party last weekend. [James] took his grandson [Chris] to the store to buy some new books.
[{('Joshua', 'father', 'James'): [('Joshua', 'sister', 'Lena'), ('Lena', 'father', 'James')]}, {('Lena', 'father', 'James'): [('Lena', 'son', 'Chris'), ('Chris', 'grandfather', 'James')]}]
['sister', 'son', 'grandfather']