[Lillian] noticed her daughter [April] was n't feeling well. [April]'s sister, [Ann], went to get medicine.
('Lillian', 'Ann')
[Lillian] noticed her daughter [April] was n't feeling well. [April]'s sister, [Ann], went to get medicine.
[{('Lillian', 'daughter', 'Ann'): [('Lillian', 'daughter', 'April'), ('April', 'sister', 'Ann')]}]
['daughter', 'sister']