[Marie] took her son [Allan] to the park for the afternoon. [Marie] decided to take a walk with her son [Mario] after dinner. [Mario]'s brother [Ronald] did n't feel like walking so he stayed at home. [Allan] went fishing with his grandfather [Harold]. They spent all day together.
('Ronald', 'Harold')
[Marie] decided to take a walk with her son [Mario] after dinner. [Mario]'s brother [Ronald] did n't feel like walking so he stayed at home. [Marie] took her son [Allan] to the park for the afternoon. [Allan] went fishing with his grandfather [Harold]. They spent all day together.
[{('Ronald', 'grandfather', 'Harold'): [('Ronald', 'mother', 'Marie'), ('Marie', 'father', 'Harold')]}, {('Marie', 'father', 'Harold'): [('Marie', 'son', 'Allan'), ('Allan', 'grandfather', 'Harold')]}, {('Ronald', 'mother', 'Marie'): [('Ronald', 'brother', 'Mario'), ('Mario', 'mother', 'Marie')]}]
['brother', 'mother', 'son', 'grandfather']