[Travis] was going out to dinner with his sister [Charlotte] when he received a call from his grandfather [Clarence].
('Charlotte', 'Clarence')
[Travis] was going out to dinner with his sister [Charlotte] when he received a call from his grandfather [Clarence].
[{('Charlotte', 'grandfather', 'Clarence'): [('Charlotte', 'brother', 'Travis'), ('Travis', 'grandfather', 'Clarence')]}]
['brother', 'grandfather']