[Dorothy] and her brother [Louis] played tennis together. [Dorothy]'s sister [Marie] has an injured leg and watched instead. [Robert] and his wife [Marie] went to his daughter [Elsie]'s school
('Louis', 'Elsie')
[Dorothy] and her brother [Louis] played tennis together. [Dorothy]'s sister [Marie] has an injured leg and watched instead. [Robert] and his wife [Marie] went to his daughter [Elsie]'s school
[{('Louis', 'niece', 'Elsie'): [('Louis', 'sister', 'Marie'), ('Marie', 'daughter', 'Elsie')]}, {('Marie', 'daughter', 'Elsie'): [('Marie', 'husband', 'Robert'), ('Robert', 'daughter', 'Elsie')]}, {('Louis', 'sister', 'Marie'): [('Louis', 'sister', 'Dorothy'), ('Dorothy', 'sister', 'Marie')]}]
['sister', 'sister', 'husband', 'daughter']