[Irvin] and his sister [Mildred] were twins. Still, they did n't look very much alike. [Frances]'s granddaughter [Tina] had a math test to study for and [Frances] helped her. [Irvin] and his sister [Tina] went to brunch today at the new diner.
('Frances', 'Mildred')
[Frances]'s granddaughter [Tina] had a math test to study for and [Frances] helped her. [Irvin] and his sister [Tina] went to brunch today at the new diner. [Irvin] and his sister [Mildred] were twins. Still, they did n't look very much alike.
[{('Frances', 'granddaughter', 'Mildred'): [('Frances', 'grandson', 'Irvin'), ('Irvin', 'sister', 'Mildred')]}, {('Frances', 'grandson', 'Irvin'): [('Frances', 'granddaughter', 'Tina'), ('Tina', 'brother', 'Irvin')]}]
['granddaughter', 'brother', 'sister']