[Glen] has a brother who is younger than him. The brother has a sister whose name is [Mary]. [Mary] loves her grandfather, [Clarence], very much. He loves her too, and they spend time together every chance they get.
('Glen', 'Clarence')
[Glen] has a brother who is younger than him. The brother has a sister whose name is [Mary]. [Mary] loves her grandfather, [Clarence], very much. He loves her too, and they spend time together every chance they get.
[{('Glen', 'grandfather', 'Clarence'): [('Glen', 'sister', 'Mary'), ('Mary', 'grandfather', 'Clarence')]}]
['sister', 'grandfather']