[Thomas] took his sister [Dolores] to the movies with him to see the new Star Wars film. [Dolores] went on a vacation with her brother [Clarence]. [Frances] took her grandson [Thomas] to taekwondo practice.
('Frances', 'Clarence')
[Frances] took her grandson [Thomas] to taekwondo practice. [Thomas] took his sister [Dolores] to the movies with him to see the new Star Wars film. [Dolores] went on a vacation with her brother [Clarence].
[{('Frances', 'grandson', 'Clarence'): [('Frances', 'granddaughter', 'Dolores'), ('Dolores', 'brother', 'Clarence')]}, {('Frances', 'granddaughter', 'Dolores'): [('Frances', 'grandson', 'Thomas'), ('Thomas', 'sister', 'Dolores')]}]
['grandson', 'sister', 'brother']