[Lillian]'s son, [Jerry], came over to her house for dinner. [John], [Jerry]'s brother, came too.
('Lillian', 'John')
[Lillian]'s son, [Jerry], came over to her house for dinner. [John], [Jerry]'s brother, came too.
[{('Lillian', 'son', 'John'): [('Lillian', 'son', 'Jerry'), ('Jerry', 'brother', 'John')]}]
['son', 'brother']