[Kevin]'s grandfather is [Clarence]. [Louise] was playing in the sandbox with her brother [Kevin].
('Louise', 'Clarence')
[Louise] was playing in the sandbox with her brother [Kevin]. [Kevin]'s grandfather is [Clarence].
[{('Louise', 'grandfather', 'Clarence'): [('Louise', 'brother', 'Kevin'), ('Kevin', 'grandfather', 'Clarence')]}]
['brother', 'grandfather']