[Dorothy] invited her sisters, [Beverly] and [Tracy], to a party. [Bernardo] and her sister [Bettie] decided to take a trip to Mexico together. [Tracy] loves playing chess her son. His name is [Bernardo].
('Bettie', 'Beverly')
[Bernardo] and her sister [Bettie] decided to take a trip to Mexico together. [Tracy] loves playing chess her son. His name is [Bernardo]. [Dorothy] invited her sisters, [Beverly] and [Tracy], to a party.
[{('Bettie', 'aunt', 'Beverly'): [('Bettie', 'mother', 'Tracy'), ('Tracy', 'sister', 'Beverly')]}, {('Tracy', 'sister', 'Beverly'): [('Tracy', 'sister', 'Dorothy'), ('Dorothy', 'sister', 'Beverly')]}, {('Bettie', 'mother', 'Tracy'): [('Bettie', 'brother', 'Bernardo'), ('Bernardo', 'mother', 'Tracy')]}]
['brother', 'mother', 'sister', 'sister']