[April] and his sister, [Janet], were playing out on the lawn. [Janet]'s grandfather, [Clarence], yelled for them to get inside.
('April', 'Clarence')
[April] and his sister, [Janet], were playing out on the lawn. [Janet]'s grandfather, [Clarence], yelled for them to get inside.
[{('April', 'grandfather', 'Clarence'): [('April', 'sister', 'Janet'), ('Janet', 'grandfather', 'Clarence')]}]
['sister', 'grandfather']