[Pedro] and his sister [Marie] went to the park. [Elsie] has a sister named [Angelica] and a brother named [Allan]. [Marie] and her daughter [Elsie] went out for ice cream. [Marie] got a cone and [Elsie] got a sundae.
('Pedro', 'Angelica')
[Pedro] and his sister [Marie] went to the park. [Marie] and her daughter [Elsie] went out for ice cream. [Marie] got a cone and [Elsie] got a sundae. [Elsie] has a sister named [Angelica] and a brother named [Allan].
[{('Pedro', 'niece', 'Angelica'): [('Pedro', 'sister', 'Marie'), ('Marie', 'daughter', 'Angelica')]}, {('Marie', 'daughter', 'Angelica'): [('Marie', 'son', 'Allan'), ('Allan', 'sister', 'Angelica')]}, {('Marie', 'son', 'Allan'): [('Marie', 'daughter', 'Elsie'), ('Elsie', 'brother', 'Allan')]}]
['sister', 'daughter', 'brother', 'sister']