[Pedro] built a playhouse for his daughter [Rebecca], which was painted by his wife [Dorothy]. [Rebecca] could n't wait for her father, [Pedro], to see the gift she bought for him. [Tracy] and [Pedro] had a picnic at the park. They had sandwiches and salad.
('Dorothy', 'Tracy')
[Pedro] built a playhouse for his daughter [Rebecca], which was painted by his wife [Dorothy]. [Rebecca] could n't wait for her father, [Pedro], to see the gift she bought for him. [Tracy] and [Pedro] had a picnic at the park. They had sandwiches and salad.
[{('Dorothy', 'sister', 'Tracy'): [('Dorothy', 'daughter', 'Rebecca'), ('Rebecca', 'aunt', 'Tracy')]}, {('Dorothy', 'daughter', 'Rebecca'): [('Dorothy', 'husband', 'Pedro'), ('Pedro', 'daughter', 'Rebecca')]}, {('Rebecca', 'aunt', 'Tracy'): [('Rebecca', 'father', 'Pedro'), ('Pedro', 'sister', 'Tracy')]}]
['husband', 'daughter', 'father', 'sister']