[Lillian] has a son named [Jerry]. [Jerry] invited his uncle [Nicholas] to dinner
('Lillian', 'Nicholas')
[Lillian] has a son named [Jerry]. [Jerry] invited his uncle [Nicholas] to dinner
[{('Lillian', 'brother', 'Nicholas'): [('Lillian', 'son', 'Jerry'), ('Jerry', 'uncle', 'Nicholas')]}]
['son', 'uncle']