[Nicolas] invited his brothers [Travis] and [Tony] over for dinner one day and they had a good time.
('Tony', 'Travis')
[Nicolas] invited his brothers [Travis] and [Tony] over for dinner one day and they had a good time.
[{('Tony', 'brother', 'Travis'): [('Tony', 'brother', 'Nicolas'), ('Nicolas', 'brother', 'Travis')]}]
['brother', 'brother']