[Chris] and his brother [Irvin] went to the football game together. [Charles] invited his grandmother, [Frances], and his brother, [Irvin], to a live concert at the fairgrounds.
('Chris', 'Frances')
[Chris] and his brother [Irvin] went to the football game together. [Charles] invited his grandmother, [Frances], and his brother, [Irvin], to a live concert at the fairgrounds.
[{('Chris', 'grandmother', 'Frances'): [('Chris', 'brother', 'Charles'), ('Charles', 'grandmother', 'Frances')]}, {('Chris', 'brother', 'Charles'): [('Chris', 'brother', 'Irvin'), ('Irvin', 'brother', 'Charles')]}]
['brother', 'brother', 'grandmother']