[Clarence] is [Lillian]'s father. [Lillian] was playing in the sandbox with her brother [Nicholas].
('Clarence', 'Nicholas')
[Clarence] is [Lillian]'s father. [Lillian] was playing in the sandbox with her brother [Nicholas].
[{('Clarence', 'son', 'Nicholas'): [('Clarence', 'daughter', 'Lillian'), ('Lillian', 'brother', 'Nicholas')]}]
['daughter', 'brother']