[Robert] and his brother [Jeff] both played soccer. [Robert] was faster, but [Jeff] had a better shot, so they complemented each other well. [Clarence] loves spending time with his grandson [Jeff]. [Jeff] and [Clarence] go the the park a lot.
('Robert', 'Clarence')
[Robert] and his brother [Jeff] both played soccer. [Robert] was faster, but [Jeff] had a better shot, so they complemented each other well. [Clarence] loves spending time with his grandson [Jeff]. [Jeff] and [Clarence] go the the park a lot.
[{('Robert', 'grandfather', 'Clarence'): [('Robert', 'brother', 'Jeff'), ('Jeff', 'grandfather', 'Clarence')]}]
['brother', 'grandfather']