[Dale] took his sister [Lillian] out to dinner for her birthday. [John] loves his mother [Lillian] very much.
('John', 'Dale')
[John] loves his mother [Lillian] very much. [Dale] took his sister [Lillian] out to dinner for her birthday.
[{('John', 'uncle', 'Dale'): [('John', 'mother', 'Lillian'), ('Lillian', 'brother', 'Dale')]}]
['mother', 'brother']