[Amy] and her brother [Wayne] played tennis together. [Amy]'s sister [Lillian] has an injured leg and watched instead.
('Wayne', 'Lillian')
[Amy] and her brother [Wayne] played tennis together. [Amy]'s sister [Lillian] has an injured leg and watched instead.
[{('Wayne', 'sister', 'Lillian'): [('Wayne', 'sister', 'Amy'), ('Amy', 'sister', 'Lillian')]}]
['sister', 'sister']