[Dorothy]'s mom, [Cheryl] got ready for the party. [Dorothy] visited her son [Jeffrey] at college. [Pedro] met his son [James] for dinner. Unfortunately [Pedro]'s son [Jeffrey] could not attend.
('Cheryl', 'James')
[Dorothy]'s mom, [Cheryl] got ready for the party. [Dorothy] visited her son [Jeffrey] at college. [Pedro] met his son [James] for dinner. Unfortunately [Pedro]'s son [Jeffrey] could not attend.
[{('Cheryl', 'brother', 'James'): [('Cheryl', 'brother', 'Jeffrey'), ('Jeffrey', 'brother', 'James')]}, {('Cheryl', 'brother', 'Jeffrey'): [('Cheryl', 'mother', 'Dorothy'), ('Dorothy', 'son', 'Jeffrey')]}, {('Jeffrey', 'brother', 'James'): [('Jeffrey', 'father', 'Pedro'), ('Pedro', 'son', 'James')]}]
['mother', 'son', 'father', 'son']