[Ronald] met his brother [Mario] for drinks after work. [Ronald]'s brother, [Mario], recently got elected as a senator. [Marie] was sad she would n't be able to spend Christmas with her daughter, [Angelica]. [Angelica] had to stay home to care for her brother, [Mario].
('Mario', 'Marie')
[Ronald]'s brother, [Mario], recently got elected as a senator. [Ronald] met his brother [Mario] for drinks after work. [Marie] was sad she would n't be able to spend Christmas with her daughter, [Angelica]. [Angelica] had to stay home to care for her brother, [Mario].
[{('Mario', 'mother', 'Marie'): [('Mario', 'brother', 'Ronald'), ('Ronald', 'mother', 'Marie')]}, {('Ronald', 'mother', 'Marie'): [('Ronald', 'sister', 'Angelica'), ('Angelica', 'mother', 'Marie')]}, {('Ronald', 'sister', 'Angelica'): [('Ronald', 'brother', 'Mario'), ('Mario', 'sister', 'Angelica')]}]
['brother', 'brother', 'sister', 'mother']