[Allan] bought a book for his father [Robert]. [Tracy]'s father, [Harold], was running late picking up his daughter, [Dorothy], from school. [Dorothy] called her brother, [Robert], up to see how he was doing after surgery.
('Tracy', 'Allan')
[Tracy]'s father, [Harold], was running late picking up his daughter, [Dorothy], from school. [Dorothy] called her brother, [Robert], up to see how he was doing after surgery. [Allan] bought a book for his father [Robert].
[{('Tracy', 'nephew', 'Allan'): [('Tracy', 'brother', 'Robert'), ('Robert', 'son', 'Allan')]}, {('Tracy', 'brother', 'Robert'): [('Tracy', 'father', 'Harold'), ('Harold', 'son', 'Robert')]}, {('Harold', 'son', 'Robert'): [('Harold', 'daughter', 'Dorothy'), ('Dorothy', 'brother', 'Robert')]}]
['father', 'daughter', 'brother', 'son']