[James] took his daughter [Lena] and his son [Hugh] out to dinner Saturday and [Lena]'s son [Irvin] also went with them.
('Irvin', 'Hugh')
[James] took his daughter [Lena] and his son [Hugh] out to dinner Saturday and [Lena]'s son [Irvin] also went with them.
[{('Irvin', 'uncle', 'Hugh'): [('Irvin', 'mother', 'Lena'), ('Lena', 'brother', 'Hugh')]}, {('Lena', 'brother', 'Hugh'): [('Lena', 'father', 'James'), ('James', 'son', 'Hugh')]}]
['mother', 'father', 'son']