[Ann] is watching t.v. with her mother [Lillian], and her brother [John] wants icecream.
('Lillian', 'John')
[Ann] is watching t.v. with her mother [Lillian], and her brother [John] wants icecream.
[{('Lillian', 'son', 'John'): [('Lillian', 'daughter', 'Ann'), ('Ann', 'brother', 'John')]}]
['daughter', 'brother']