[Thomas] visited his aunt [Lena]. [Joshua] went to pick up his son [Thomas] from the baseball practice. [Frances] took her daughter, [Lena], to lunch.
('Joshua', 'Frances')
[Joshua] went to pick up his son [Thomas] from the baseball practice. [Thomas] visited his aunt [Lena]. [Frances] took her daughter, [Lena], to lunch.
[{('Joshua', 'mother', 'Frances'): [('Joshua', 'sister', 'Lena'), ('Lena', 'mother', 'Frances')]}, {('Joshua', 'sister', 'Lena'): [('Joshua', 'son', 'Thomas'), ('Thomas', 'aunt', 'Lena')]}]
['son', 'aunt', 'mother']