[Michael]'s mother [Amy] secretly put money away for him to go on a trip next fall. [Amy]'s son, [Glen], was busy with school activities and forgot to meet his sister.
('Michael', 'Glen')
[Michael]'s mother [Amy] secretly put money away for him to go on a trip next fall. [Amy]'s son, [Glen], was busy with school activities and forgot to meet his sister.
[{('Michael', 'brother', 'Glen'): [('Michael', 'mother', 'Amy'), ('Amy', 'son', 'Glen')]}]
['mother', 'son']