[Ernest] does not know he has a son named [Thomas]. [Herman] helped his brother, [Ernest], study for the chemistry exam.
('Herman', 'Thomas')
[Herman] helped his brother, [Ernest], study for the chemistry exam. [Ernest] does not know he has a son named [Thomas].
[{('Herman', 'nephew', 'Thomas'): [('Herman', 'brother', 'Ernest'), ('Ernest', 'son', 'Thomas')]}]