[Francisco] loved teaching his son, [Richard], baseball. [Cindy] loves playing chess her son. His name is [Richard]. [Lena] and her sister [Cindy] played golf together. [Lena] won easily.
('Francisco', 'Lena')
[Francisco] loved teaching his son, [Richard], baseball. [Cindy] loves playing chess her son. His name is [Richard]. [Lena] and her sister [Cindy] played golf together. [Lena] won easily.
[{('Francisco', 'sister', 'Lena'): [('Francisco', 'son', 'Richard'), ('Richard', 'aunt', 'Lena')]}, {('Richard', 'aunt', 'Lena'): [('Richard', 'mother', 'Cindy'), ('Cindy', 'sister', 'Lena')]}]
['son', 'mother', 'sister']