[Robert] took a vacation from his job to visit his mother [Martha] across the country for Mother's Day. [Martha] does n't like her brother [Ernest].
('Robert', 'Ernest')
[Robert] took a vacation from his job to visit his mother [Martha] across the country for Mother's Day. [Martha] does n't like her brother [Ernest].
[{('Robert', 'uncle', 'Ernest'): [('Robert', 'mother', 'Martha'), ('Martha', 'brother', 'Ernest')]}]