[Natalia] invited her mother, [Amy], to dinner and extended the invitation to [Amy]'s son, [Dennis].
('Natalia', 'Dennis')
[Natalia] invited her mother, [Amy], to dinner and extended the invitation to [Amy]'s son, [Dennis].
[{('Natalia', 'brother', 'Dennis'): [('Natalia', 'mother', 'Amy'), ('Amy', 'son', 'Dennis')]}]
['mother', 'son']