[Clarence] took his grandson [John] to the mall. [John]'s sister [Janet] was jealous.
('Janet', 'Clarence')
[Clarence] took his grandson [John] to the mall. [John]'s sister [Janet] was jealous.
[{('Janet', 'grandfather', 'Clarence'): [('Janet', 'brother', 'John'), ('John', 'grandfather', 'Clarence')]}]
['brother', 'grandfather']