[David] talks to her sister [Lynn] on the phone each night before bed. [Wesley] is lucky if he talks to his sister [David] once a month. [Charles] bought a book for his father [Wesley].
('Lynn', 'Charles')
[David] talks to her sister [Lynn] on the phone each night before bed. [Wesley] is lucky if he talks to his sister [David] once a month. [Charles] bought a book for his father [Wesley].
[{('Lynn', 'nephew', 'Charles'): [('Lynn', 'brother', 'Wesley'), ('Wesley', 'son', 'Charles')]}, {('Lynn', 'brother', 'Wesley'): [('Lynn', 'sister', 'David'), ('David', 'brother', 'Wesley')]}]
['sister', 'brother', 'son']