[Heidi] took her grandfather [Clarence] and sister [Louise] on a hiking trip two weekends ago.
('Clarence', 'Louise')
[Heidi] took her grandfather [Clarence] and sister [Louise] on a hiking trip two weekends ago.
[{('Clarence', 'granddaughter', 'Louise'): [('Clarence', 'granddaughter', 'Heidi'), ('Heidi', 'sister', 'Louise')]}]
['granddaughter', 'sister']