[Joshua] met his son [Joseph] for dinner. Unfortunately [Joshua]'s son [Thomas] could not attend. [Frances] is the grandmother of her grandson, [Thomas]
('Frances', 'Joseph')
[Frances] is the grandmother of her grandson, [Thomas] [Joshua] met his son [Joseph] for dinner. Unfortunately [Joshua]'s son [Thomas] could not attend.
[{('Frances', 'grandson', 'Joseph'): [('Frances', 'grandson', 'Thomas'), ('Thomas', 'brother', 'Joseph')]}, {('Thomas', 'brother', 'Joseph'): [('Thomas', 'father', 'Joshua'), ('Joshua', 'son', 'Joseph')]}]
['grandson', 'father', 'son']