[Clarence] took his grandson [Douglas] to the lake so they could feed the ducks. [John] and his brother [Douglas] went to see a baseball game on Friday and had a great time.
('Clarence', 'John')
[Clarence] took his grandson [Douglas] to the lake so they could feed the ducks. [John] and his brother [Douglas] went to see a baseball game on Friday and had a great time.
[{('Clarence', 'grandson', 'John'): [('Clarence', 'grandson', 'Douglas'), ('Douglas', 'brother', 'John')]}]
['grandson', 'brother']