[Wesley]'s son, [Chris], loves trains. [Wesley]'s sister, [David], got him a nice model trail set for his birthday. [Lena] took her son [Chris] to the football game.
('Lena', 'David')
[Lena] took her son [Chris] to the football game. [Wesley]'s son, [Chris], loves trains. [Wesley]'s sister, [David], got him a nice model trail set for his birthday.
[{('Lena', 'sister', 'David'): [('Lena', 'son', 'Chris'), ('Chris', 'aunt', 'David')]}, {('Chris', 'aunt', 'David'): [('Chris', 'father', 'Wesley'), ('Wesley', 'sister', 'David')]}]
['son', 'father', 'sister']