[Joshua] bought a book for his father [James]. [Brandon] wanted to stay with his mother [David] for the weekend, but she insisted that he visit his grandfather [James] instead.
('David', 'Joshua')
[Brandon] wanted to stay with his mother [David] for the weekend, but she insisted that he visit his grandfather [James] instead. [Joshua] bought a book for his father [James].
[{('David', 'brother', 'Joshua'): [('David', 'father', 'James'), ('James', 'son', 'Joshua')]}, {('David', 'father', 'James'): [('David', 'son', 'Brandon'), ('Brandon', 'grandfather', 'James')]}]
['son', 'grandfather', 'son']