[Joshua] and his sister [Cindy] went to the park. [Theodore] was enjoying the delicious meal prepared by his mother [Lena]. [Lena] was playing in the sandbox with her brother [Joshua].
('Theodore', 'Cindy')
[Theodore] was enjoying the delicious meal prepared by his mother [Lena]. [Lena] was playing in the sandbox with her brother [Joshua]. [Joshua] and his sister [Cindy] went to the park.
[{('Theodore', 'aunt', 'Cindy'): [('Theodore', 'mother', 'Lena'), ('Lena', 'sister', 'Cindy')]}, {('Lena', 'sister', 'Cindy'): [('Lena', 'brother', 'Joshua'), ('Joshua', 'sister', 'Cindy')]}]
['mother', 'brother', 'sister']