[Lena] invited her mother, [Frances], to dinner and extended the invitation to [Frances]'s son, [Hugh]. [Hugh] does not know he has a son named [Bobby].
('Lena', 'Bobby')
[Lena] invited her mother, [Frances], to dinner and extended the invitation to [Frances]'s son, [Hugh]. [Hugh] does not know he has a son named [Bobby].
[{('Lena', 'nephew', 'Bobby'): [('Lena', 'brother', 'Hugh'), ('Hugh', 'son', 'Bobby')]}, {('Lena', 'brother', 'Hugh'): [('Lena', 'mother', 'Frances'), ('Frances', 'son', 'Hugh')]}]
['mother', 'son', 'son']