[Martha] did not go to her brother [Herman]'s baseball game because her and her mother, [Mary] were at the store.
('Mary', 'Herman')
[Martha] did not go to her brother [Herman]'s baseball game because her and her mother, [Mary] were at the store.
[{('Mary', 'son', 'Herman'): [('Mary', 'daughter', 'Martha'), ('Martha', 'brother', 'Herman')]}]