[Martha]'s mom, [Mary], has recently taken art classes. [Martha]'s son [Brent] missed seeing his mother on the weekends.
('Brent', 'Mary')
[Martha]'s son [Brent] missed seeing his mother on the weekends. [Martha]'s mom, [Mary], has recently taken art classes.
[{('Brent', 'grandmother', 'Mary'): [('Brent', 'mother', 'Martha'), ('Martha', 'mother', 'Mary')]}]