[Michael] liked playing with his brother [Dennis] more than anyone else. This made [Mary] jealous of her brother [Dennis].
('Mary', 'Michael')
[Michael] liked playing with his brother [Dennis] more than anyone else. This made [Mary] jealous of her brother [Dennis].
[{('Mary', 'brother', 'Michael'): [('Mary', 'brother', 'Dennis'), ('Dennis', 'brother', 'Michael')]}]
['brother', 'brother']