[Dorothy] was playing games with her son [Roberto]. [Roberto]'s sister [Heather] did n't want to join them. [Jeffrey] asked his mother [Dorothy] to read to him. [Dorothy] was too busy. [Harold] was very excited to meet his new grandson [Jeffrey].
('Harold', 'Heather')
[Harold] was very excited to meet his new grandson [Jeffrey]. [Jeffrey] asked his mother [Dorothy] to read to him. [Dorothy] was too busy. [Dorothy] was playing games with her son [Roberto]. [Roberto]'s sister [Heather] did n't want to join them.
[{('Harold', 'granddaughter', 'Heather'): [('Harold', 'grandson', 'Jeffrey'), ('Jeffrey', 'sister', 'Heather')]}, {('Jeffrey', 'sister', 'Heather'): [('Jeffrey', 'brother', 'Roberto'), ('Roberto', 'sister', 'Heather')]}, {('Jeffrey', 'brother', 'Roberto'): [('Jeffrey', 'mother', 'Dorothy'), ('Dorothy', 'son', 'Roberto')]}]
['grandson', 'mother', 'son', 'sister']