[Marie] drove her son [Allan] to his soccer game. [Ronald]'s mother [Marie] bought a Christmas gift for his sister, [Angelica]. [Angelica] went car shopping with her brother [Ronald].
('Ronald', 'Allan')
[Angelica] went car shopping with her brother [Ronald]. [Ronald]'s mother [Marie] bought a Christmas gift for his sister, [Angelica]. [Marie] drove her son [Allan] to his soccer game.
[{('Ronald', 'brother', 'Allan'): [('Ronald', 'sister', 'Angelica'), ('Angelica', 'brother', 'Allan')]}, {('Angelica', 'brother', 'Allan'): [('Angelica', 'mother', 'Marie'), ('Marie', 'son', 'Allan')]}, {('Angelica', 'mother', 'Marie'): [('Angelica', 'brother', 'Ronald'), ('Ronald', 'mother', 'Marie')]}]
['sister', 'brother', 'mother', 'son']