[Louis] made dinner reservations for his sister [Marie]. [Harold] went to pick up his son [Louis] from the baseball practice. [Elsie]'s mother, [Marie], was eager to see [Elsie]'s brother, [Allan].
('Harold', 'Allan')
[Harold] went to pick up his son [Louis] from the baseball practice. [Louis] made dinner reservations for his sister [Marie]. [Elsie]'s mother, [Marie], was eager to see [Elsie]'s brother, [Allan].
[{('Harold', 'grandson', 'Allan'): [('Harold', 'daughter', 'Marie'), ('Marie', 'son', 'Allan')]}, {('Marie', 'son', 'Allan'): [('Marie', 'daughter', 'Elsie'), ('Elsie', 'brother', 'Allan')]}, {('Harold', 'daughter', 'Marie'): [('Harold', 'son', 'Louis'), ('Louis', 'sister', 'Marie')]}]
['son', 'sister', 'daughter', 'brother']