[Frances] enjoys making burritos for her son. His name is [Hugh]. [David] was unhappy with her son, [Johnson], and his grades. She enlisted a tutor to help him. [Hugh] bought a book for his son [Johnson].
('David', 'Frances')
[David] was unhappy with her son, [Johnson], and his grades. She enlisted a tutor to help him. [Hugh] bought a book for his son [Johnson]. [Frances] enjoys making burritos for her son. His name is [Hugh].
[{('David', 'mother', 'Frances'): [('David', 'son', 'Johnson'), ('Johnson', 'grandmother', 'Frances')]}, {('Johnson', 'grandmother', 'Frances'): [('Johnson', 'father', 'Hugh'), ('Hugh', 'mother', 'Frances')]}]
['son', 'father', 'mother']