[Nicolas] loved his mother, [Theresa]. [Theresa]'s sister, [Amy], recently started acting.
('Amy', 'Nicolas')
[Theresa]'s sister, [Amy], recently started acting. [Nicolas] loved his mother, [Theresa].
[{('Amy', 'nephew', 'Nicolas'): [('Amy', 'sister', 'Theresa'), ('Theresa', 'son', 'Nicolas')]}]
['sister', 'son']