[Louise] went to the party with her brother [Kevin] and her sister [Lorraine].
('Lorraine', 'Kevin')
[Louise] went to the party with her brother [Kevin] and her sister [Lorraine].
[{('Lorraine', 'brother', 'Kevin'): [('Lorraine', 'sister', 'Louise'), ('Louise', 'brother', 'Kevin')]}]
['sister', 'brother']