[Douglas] and his father [George] played video games all day last Saturday. [George] and his sister [Theresa] walked to school together every day, since they only lived two blocks away from the school.
('Douglas', 'Theresa')
[Douglas] and his father [George] played video games all day last Saturday. [George] and his sister [Theresa] walked to school together every day, since they only lived two blocks away from the school.
[{('Douglas', 'aunt', 'Theresa'): [('Douglas', 'father', 'George'), ('George', 'sister', 'Theresa')]}]
['father', 'sister']