[Brent] went to visit his sister [Ann]. But [Ann] was already hanging out with [Roy] which is [Brent]'s grandfather.
('Roy', 'Ann')
[Brent] went to visit his sister [Ann]. But [Ann] was already hanging out with [Roy] which is [Brent]'s grandfather.
[{('Roy', 'granddaughter', 'Ann'): [('Roy', 'grandson', 'Brent'), ('Brent', 'sister', 'Ann')]}]