[Dale] took his son [Nicolas] to batting practice with his baseball team, but had to leave him there alone for an hour to pick up his daughter [June].
('June', 'Nicolas')
[Dale] took his son [Nicolas] to batting practice with his baseball team, but had to leave him there alone for an hour to pick up his daughter [June].
[{('June', 'brother', 'Nicolas'): [('June', 'father', 'Dale'), ('Dale', 'son', 'Nicolas')]}]
['father', 'son']