[Amy] baked a cake for her son [Glen]. [Mary]'s mom, [Amy], has recently taken art classes.
('Mary', 'Glen')
[Mary]'s mom, [Amy], has recently taken art classes. [Amy] baked a cake for her son [Glen].
[{('Mary', 'brother', 'Glen'): [('Mary', 'mother', 'Amy'), ('Amy', 'son', 'Glen')]}]
['mother', 'son']