[Lillian] has a son named [John]. [Clarence] loves his daughter [Lillian].
('Clarence', 'John')
[Clarence] loves his daughter [Lillian]. [Lillian] has a son named [John].
[{('Clarence', 'grandson', 'John'): [('Clarence', 'daughter', 'Lillian'), ('Lillian', 'son', 'John')]}]
['daughter', 'son']