[Clarence] took his daughter [Nancy] out for lunch one day. [Nancy] asked if she could bring her son [Jeff] and [Clarence] said okay.
('Clarence', 'Jeff')
[Clarence] took his daughter [Nancy] out for lunch one day. [Nancy] asked if she could bring her son [Jeff] and [Clarence] said okay.
[{('Clarence', 'grandson', 'Jeff'): [('Clarence', 'daughter', 'Nancy'), ('Nancy', 'son', 'Jeff')]}]
['daughter', 'son']