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