[Louis] took a cab to the mall with his sister [Tracy]. [Tracy]'s sister [Dorothy] drove herself there. [Nettie] asked her father [Louis] if she could spend the night with a friend and he said okay. [Karen]'s sister, [Nettie], recently started acting.
('Dorothy', 'Karen')
[Louis] took a cab to the mall with his sister [Tracy]. [Tracy]'s sister [Dorothy] drove herself there. [Nettie] asked her father [Louis] if she could spend the night with a friend and he said okay. [Karen]'s sister, [Nettie], recently started acting.
[{('Dorothy', 'niece', 'Karen'): [('Dorothy', 'brother', 'Louis'), ('Louis', 'daughter', 'Karen')]}, {('Dorothy', 'brother', 'Louis'): [('Dorothy', 'sister', 'Tracy'), ('Tracy', 'brother', 'Louis')]}, {('Louis', 'daughter', 'Karen'): [('Louis', 'daughter', 'Nettie'), ('Nettie', 'sister', 'Karen')]}]
['sister', 'brother', 'daughter', 'sister']