Mary had two daughters [Lynn] and [David] that were very close in age. She did n't have her son [Francisco] until the girls were almost old enough to move out. [Francisco] took his daughter [Wilhelmina] to the bookstore, and bought her some books from her favorite author.
('David', 'Wilhelmina')
Mary had two daughters [Lynn] and [David] that were very close in age. She did n't have her son [Francisco] until the girls were almost old enough to move out. [Francisco] took his daughter [Wilhelmina] to the bookstore, and bought her some books from her favorite author.
[{('David', 'niece', 'Wilhelmina'): [('David', 'brother', 'Francisco'), ('Francisco', 'daughter', 'Wilhelmina')]}, {('David', 'brother', 'Francisco'): [('David', 'sister', 'Lynn'), ('Lynn', 'brother', 'Francisco')]}]
['sister', 'brother', 'daughter']