[Lena]'s son [Irvin] and son [Chris] went to the park together to play. [Irvin] adores his Grandmother, [Frances].
('Frances', 'Chris')
[Irvin] adores his Grandmother, [Frances]. [Lena]'s son [Irvin] and son [Chris] went to the park together to play.
[{('Frances', 'grandson', 'Chris'): [('Frances', 'grandson', 'Irvin'), ('Irvin', 'brother', 'Chris')]}, {('Irvin', 'brother', 'Chris'): [('Irvin', 'mother', 'Lena'), ('Lena', 'son', 'Chris')]}]
['grandson', 'mother', 'son']