[Louise] invited her mother, [Nancy], to dinner and extended the invitation to [Nancy]'s son, [Kevin].
('Louise', 'Kevin')
[Louise] invited her mother, [Nancy], to dinner and extended the invitation to [Nancy]'s son, [Kevin].
[{('Louise', 'brother', 'Kevin'): [('Louise', 'mother', 'Nancy'), ('Nancy', 'son', 'Kevin')]}]
['mother', 'son']