[Heidi] gave her grandfather, [Clarence], a hug when she saw him. [Heidi] and her mother [Nancy] attended a play at the theater.
('Nancy', 'Clarence')
[Heidi] and her mother [Nancy] attended a play at the theater. [Heidi] gave her grandfather, [Clarence], a hug when she saw him.
[{('Nancy', 'father', 'Clarence'): [('Nancy', 'daughter', 'Heidi'), ('Heidi', 'grandfather', 'Clarence')]}]
['daughter', 'grandfather']