[Martha] has a son named [Brent]. [John] and his wife, [Martha], have been happily married for 20 years. They hope to stay married for life.
('John', 'Brent')
[John] and his wife, [Martha], have been happily married for 20 years. They hope to stay married for life. [Martha] has a son named [Brent].
[{('John', 'son', 'Brent'): [('John', 'wife', 'Martha'), ('Martha', 'son', 'Brent')]}]