[Dennis] and his father [Nicholas] played video games all day last Saturday. [Natalia] loves her brother [Dennis].
('Natalia', 'Nicholas')
[Natalia] loves her brother [Dennis]. [Dennis] and his father [Nicholas] played video games all day last Saturday.
[{('Natalia', 'father', 'Nicholas'): [('Natalia', 'brother', 'Dennis'), ('Dennis', 'father', 'Nicholas')]}]
['brother', 'father']