[James] had a grandson [Chris] who went to college at his alma mater. [Chris] graduated with honors [Theodore] invited his sister [Tina] to dinner. [Theodore]'s brother [Chris] was too busy to attend.
('James', 'Tina')
[James] had a grandson [Chris] who went to college at his alma mater. [Chris] graduated with honors [Theodore] invited his sister [Tina] to dinner. [Theodore]'s brother [Chris] was too busy to attend.
[{('James', 'granddaughter', 'Tina'): [('James', 'grandson', 'Theodore'), ('Theodore', 'sister', 'Tina')]}, {('James', 'grandson', 'Theodore'): [('James', 'grandson', 'Chris'), ('Chris', 'brother', 'Theodore')]}]
['grandson', 'brother', 'sister']