[April]'s sister [Ann] painted a picture for [April]'s mother, [Lillian].
('Lillian', 'Ann')
[April]'s sister [Ann] painted a picture for [April]'s mother, [Lillian].
[{('Lillian', 'daughter', 'Ann'): [('Lillian', 'daughter', 'April'), ('April', 'sister', 'Ann')]}]
['daughter', 'sister']