[Chris] helped his brother, [Charles], study for the chemistry exam. [Martha] and her brother [Charles] sat down together to clip coupons. [James] took his granddaughter [Martha] to the state fair. Even though his knees slowed him down a bit, [Martha] was happy that grandpa [James] was able to come with her.
('Chris', 'James')
[Chris] helped his brother, [Charles], study for the chemistry exam. [Martha] and her brother [Charles] sat down together to clip coupons. [James] took his granddaughter [Martha] to the state fair. Even though his knees slowed him down a bit, [Martha] was happy that grandpa [James] was able to come with her.
[{('Chris', 'grandfather', 'James'): [('Chris', 'sister', 'Martha'), ('Martha', 'grandfather', 'James')]}, {('Chris', 'sister', 'Martha'): [('Chris', 'brother', 'Charles'), ('Charles', 'sister', 'Martha')]}]
['brother', 'sister', 'grandfather']