[George] grilled some hot dogs for his daughter [Andrea]. [Andrea]'s sister [April] is a vegan and ate a salad.
('April', 'George')
[George] grilled some hot dogs for his daughter [Andrea]. [Andrea]'s sister [April] is a vegan and ate a salad.
[{('April', 'father', 'George'): [('April', 'sister', 'Andrea'), ('Andrea', 'father', 'George')]}]
['sister', 'father']