[Douglas] and his brother [John] are constantly trying to one up each other. [Clarence]'s grandson [John] wants a new sled for Christmas.
('Douglas', 'Clarence')
[Douglas] and his brother [John] are constantly trying to one up each other. [Clarence]'s grandson [John] wants a new sled for Christmas.
[{('Douglas', 'grandfather', 'Clarence'): [('Douglas', 'brother', 'John'), ('John', 'grandfather', 'Clarence')]}]
['brother', 'grandfather']