[Nicolas] invited his grandmother, [Ashley], and his brother, [Travis], to a live concert at the fairgrounds.
('Travis', 'Ashley')
[Nicolas] invited his grandmother, [Ashley], and his brother, [Travis], to a live concert at the fairgrounds.
[{('Travis', 'grandmother', 'Ashley'): [('Travis', 'brother', 'Nicolas'), ('Nicolas', 'grandmother', 'Ashley')]}]
['brother', 'grandmother']