[Lena] was telling stories to her sons [Theodore] and [Irvin]. [Irvin]'s sister [Mildred] was n't interested, though, so she watched TV instead.
('Mildred', 'Theodore')
[Lena] was telling stories to her sons [Theodore] and [Irvin]. [Irvin]'s sister [Mildred] was n't interested, though, so she watched TV instead.
[{('Mildred', 'brother', 'Theodore'): [('Mildred', 'brother', 'Irvin'), ('Irvin', 'brother', 'Theodore')]}, {('Irvin', 'brother', 'Theodore'): [('Irvin', 'mother', 'Lena'), ('Lena', 'son', 'Theodore')]}]
['brother', 'mother', 'son']