[Ann] loves her mother, [Lillian]. [Lillian]'s son, [John], feels the same way.
('Ann', 'John')
[Ann] loves her mother, [Lillian]. [Lillian]'s son, [John], feels the same way.
[{('Ann', 'brother', 'John'): [('Ann', 'mother', 'Lillian'), ('Lillian', 'son', 'John')]}]
['mother', 'son']