[April]'s mother, [Lillian], was eager to see [April]'s brother, [John].
('Lillian', 'John')
[April]'s mother, [Lillian], was eager to see [April]'s brother, [John].
[{('Lillian', 'son', 'John'): [('Lillian', 'daughter', 'April'), ('April', 'brother', 'John')]}]
['daughter', 'brother']