[Clarence] walked his daughters [Amy] and [Theresa] to school.
('Theresa', 'Amy')
[Clarence] walked his daughters [Amy] and [Theresa] to school.
[{('Theresa', 'sister', 'Amy'): [('Theresa', 'father', 'Clarence'), ('Clarence', 'daughter', 'Amy')]}]
['father', 'daughter']