[David] took her younger sister [Lena] to the carnival last weekend. [Gloria] and her mother [David] went to volunteer at the homeless shelter last weekend. [Joshua] took his niece [Gloria] fishing Saturday. They caught a couple small fish.
('Lena', 'Joshua')
[David] took her younger sister [Lena] to the carnival last weekend. [Gloria] and her mother [David] went to volunteer at the homeless shelter last weekend. [Joshua] took his niece [Gloria] fishing Saturday. They caught a couple small fish.
[{('Lena', 'brother', 'Joshua'): [('Lena', 'sister', 'David'), ('David', 'brother', 'Joshua')]}, {('David', 'brother', 'Joshua'): [('David', 'daughter', 'Gloria'), ('Gloria', 'uncle', 'Joshua')]}]
['sister', 'daughter', 'uncle']