[Dennis] and his sister [Jennifer] went to the movies to watch the newest superhero flick. [Jennifer] took her mother, [Amy], out for lunch.
('Dennis', 'Amy')
[Dennis] and his sister [Jennifer] went to the movies to watch the newest superhero flick. [Jennifer] took her mother, [Amy], out for lunch.
[{('Dennis', 'mother', 'Amy'): [('Dennis', 'sister', 'Jennifer'), ('Jennifer', 'mother', 'Amy')]}]
['sister', 'mother']