[Francisco] met his son [Wayne] for dinner. Unfortunately [Francisco]'s son [Richard] could not attend. [Frances] bought a new video game for her grandson [Richard].
('Frances', 'Wayne')
[Frances] bought a new video game for her grandson [Richard]. [Francisco] met his son [Wayne] for dinner. Unfortunately [Francisco]'s son [Richard] could not attend.
[{('Frances', 'grandson', 'Wayne'): [('Frances', 'grandson', 'Richard'), ('Richard', 'brother', 'Wayne')]}, {('Richard', 'brother', 'Wayne'): [('Richard', 'father', 'Francisco'), ('Francisco', 'son', 'Wayne')]}]
['grandson', 'father', 'son']