[James] took his son [Francisco] to the zoo yesterday because he took his daughter [Lena] last week [Frances] took her son [Francisco] to school this morning because he missed the bus.
('Frances', 'Lena')
[Frances] took her son [Francisco] to school this morning because he missed the bus. [James] took his son [Francisco] to the zoo yesterday because he took his daughter [Lena] last week
[{('Frances', 'daughter', 'Lena'): [('Frances', 'son', 'Francisco'), ('Francisco', 'sister', 'Lena')]}, {('Francisco', 'sister', 'Lena'): [('Francisco', 'father', 'James'), ('James', 'daughter', 'Lena')]}]
['son', 'father', 'daughter']