[Clarence]'s daughter [Nancy] had to stay home from work today. She stayed home to watch her son [Jeff] who was sick.
('Clarence', 'Jeff')
[Clarence]'s daughter [Nancy] had to stay home from work today. She stayed home to watch her son [Jeff] who was sick.
[{('Clarence', 'grandson', 'Jeff'): [('Clarence', 'daughter', 'Nancy'), ('Nancy', 'son', 'Jeff')]}]
['daughter', 'son']