[Amy] invited her father [Clarence] to dinner. [Dennis] loved his mother, [Amy].
('Clarence', 'Dennis')
[Amy] invited her father [Clarence] to dinner. [Dennis] loved his mother, [Amy].
[{('Clarence', 'grandson', 'Dennis'): [('Clarence', 'daughter', 'Amy'), ('Amy', 'son', 'Dennis')]}]
['daughter', 'son']