[Lillian] took her father [Clarence] to a concert Friday and her daughter [April] went with them.
('April', 'Clarence')
[Lillian] took her father [Clarence] to a concert Friday and her daughter [April] went with them.
[{('April', 'grandfather', 'Clarence'): [('April', 'mother', 'Lillian'), ('Lillian', 'father', 'Clarence')]}]
['mother', 'father']