[John] and his mother [Lillian] went to the animal shelter to adopt a cat. [April] does n't like her brother [John].
('April', 'Lillian')
[April] does n't like her brother [John]. [John] and his mother [Lillian] went to the animal shelter to adopt a cat.
[{('April', 'mother', 'Lillian'): [('April', 'brother', 'John'), ('John', 'mother', 'Lillian')]}]
['brother', 'mother']