[Herman] took his son [Danny] out for ice cream. [Herman]'s son [Guy], was still in school.
('Guy', 'Danny')
[Herman] took his son [Danny] out for ice cream. [Herman]'s son [Guy], was still in school.
[{('Guy', 'brother', 'Danny'): [('Guy', 'father', 'Herman'), ('Herman', 'son', 'Danny')]}]