[April]'s mother, [Lillian], was sick. [Lillian]'s sister, [Nancy], was taking care of her.
('April', 'Nancy')
[April]'s mother, [Lillian], was sick. [Lillian]'s sister, [Nancy], was taking care of her.
[{('April', 'aunt', 'Nancy'): [('April', 'mother', 'Lillian'), ('Lillian', 'sister', 'Nancy')]}]
['mother', 'sister']