[Lorraine] asked her brother [Kevin] if he wanted to go to the skating rink. [Kevin] saw his younger sister [Heidi] crying because she wanted to skate too, but could n't with her broken leg.
('Heidi', 'Lorraine')
[Lorraine] asked her brother [Kevin] if he wanted to go to the skating rink. [Kevin] saw his younger sister [Heidi] crying because she wanted to skate too, but could n't with her broken leg.
[{('Heidi', 'sister', 'Lorraine'): [('Heidi', 'brother', 'Kevin'), ('Kevin', 'sister', 'Lorraine')]}]
['brother', 'sister']