[John] was n't sure if he actually wanted to visit his sister [Janet]. After he thought about it, he decided to visit his brother [Douglas] instead.
('Douglas', 'Janet')
[John] was n't sure if he actually wanted to visit his sister [Janet]. After he thought about it, he decided to visit his brother [Douglas] instead.
[{('Douglas', 'sister', 'Janet'): [('Douglas', 'brother', 'John'), ('John', 'sister', 'Janet')]}]
['brother', 'sister']