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