[Louis] asked his father, [Harold] to help him build a birdhouse. [Louis]'s sister, [Dorothy], was crying, so he told her a joke. She laughed, and felt better. [Dorothy] and her brother [Robert] got into a fight. [Allan], [Robert]'s son, stopped speaking to both of them because of it.
('Harold', 'Allan')
[Louis] asked his father, [Harold] to help him build a birdhouse. [Louis]'s sister, [Dorothy], was crying, so he told her a joke. She laughed, and felt better. [Dorothy] and her brother [Robert] got into a fight. [Allan], [Robert]'s son, stopped speaking to both of them because of it.
[{('Harold', 'grandson', 'Allan'): [('Harold', 'son', 'Robert'), ('Robert', 'son', 'Allan')]}, {('Harold', 'son', 'Robert'): [('Harold', 'son', 'Louis'), ('Louis', 'brother', 'Robert')]}, {('Louis', 'brother', 'Robert'): [('Louis', 'sister', 'Dorothy'), ('Dorothy', 'brother', 'Robert')]}]
['son', 'sister', 'brother', 'son']