[Lillian]'s sister, [Amy], does not get along very well with [Lillian]'s son, [Douglas].
('Amy', 'Douglas')
[Lillian]'s sister, [Amy], does not get along very well with [Lillian]'s son, [Douglas].
[{('Amy', 'nephew', 'Douglas'): [('Amy', 'sister', 'Lillian'), ('Lillian', 'son', 'Douglas')]}]
['sister', 'son']