[Milton] took his sister [Jennifer] to get some ice cream after school was over and then he called his grandfather [Clarence] to see if he still wanted to go fishing tomorrow.
('Clarence', 'Jennifer')
[Milton] took his sister [Jennifer] to get some ice cream after school was over and then he called his grandfather [Clarence] to see if he still wanted to go fishing tomorrow.
[{('Clarence', 'granddaughter', 'Jennifer'): [('Clarence', 'grandson', 'Milton'), ('Milton', 'sister', 'Jennifer')]}]
['grandson', 'sister']