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