[Pedro] took his son [Jeffrey] and [Jeffrey]'s sister [Heather] to visit [Shantel], [Heather]'s grandmother. [Pedro] and his wife [Dorothy] went to a lovely anniversary dinner.
('Dorothy', 'Shantel')
[Pedro] and his wife [Dorothy] went to a lovely anniversary dinner. [Pedro] took his son [Jeffrey] and [Jeffrey]'s sister [Heather] to visit [Shantel], [Heather]'s grandmother.
[{('Dorothy', 'mother-in-law', 'Shantel'): [('Dorothy', 'husband', 'Pedro'), ('Pedro', 'mother', 'Shantel')]}, {('Pedro', 'mother', 'Shantel'): [('Pedro', 'daughter', 'Heather'), ('Heather', 'grandmother', 'Shantel')]}, {('Pedro', 'daughter', 'Heather'): [('Pedro', 'son', 'Jeffrey'), ('Jeffrey', 'sister', 'Heather')]}]
['husband', 'son', 'sister', 'grandmother']