[Jeff] and his brother [Robert] went to the football game together. [Clarence]'s grandson [Robert] wants a new sled for Christmas.
('Jeff', 'Clarence')
[Jeff] and his brother [Robert] went to the football game together. [Clarence]'s grandson [Robert] wants a new sled for Christmas.
[{('Jeff', 'grandfather', 'Clarence'): [('Jeff', 'brother', 'Robert'), ('Robert', 'grandfather', 'Clarence')]}]
['brother', 'grandfather']