[Clarence] took his grandson [Nicolas] to the lake so they could feed the ducks. [Nicolas] was angry with his brother [Travis] for forgetting to pick him up from school.
('Clarence', 'Travis')
[Clarence] took his grandson [Nicolas] to the lake so they could feed the ducks. [Nicolas] was angry with his brother [Travis] for forgetting to pick him up from school.
[{('Clarence', 'grandson', 'Travis'): [('Clarence', 'grandson', 'Nicolas'), ('Nicolas', 'brother', 'Travis')]}]
['grandson', 'brother']