[Lillian] went to the basketball game with her brother [Nicholas], who brought along his son [Michael].
('Lillian', 'Michael')
[Lillian] went to the basketball game with her brother [Nicholas], who brought along his son [Michael].
[{('Lillian', 'nephew', 'Michael'): [('Lillian', 'brother', 'Nicholas'), ('Nicholas', 'son', 'Michael')]}]
['brother', 'son']