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