[Dennis] went to the park with his sister, [Natalia], and his father, [Nicholas]. The three of them had a wonderful time there.
('Natalia', 'Nicholas')
[Dennis] went to the park with his sister, [Natalia], and his father, [Nicholas]. The three of them had a wonderful time there.
[{('Natalia', 'father', 'Nicholas'): [('Natalia', 'brother', 'Dennis'), ('Dennis', 'father', 'Nicholas')]}]
['brother', 'father']