[Richard] and his father [Francisco] played video games all day last Saturday. [Natasha] and her brother [Richard] played ball outside. [Natasha]'s brother [Wayne] stayed inside.
('Wayne', 'Francisco')
[Natasha] and her brother [Richard] played ball outside. [Natasha]'s brother [Wayne] stayed inside. [Richard] and his father [Francisco] played video games all day last Saturday.
[{('Wayne', 'father', 'Francisco'): [('Wayne', 'sister', 'Natasha'), ('Natasha', 'father', 'Francisco')]}, {('Natasha', 'father', 'Francisco'): [('Natasha', 'brother', 'Richard'), ('Richard', 'father', 'Francisco')]}]
['sister', 'brother', 'father']