[Roberto] wanted to go swimming with her brother, [Jeffrey]. [Jeffrey], however, was n't interested as he wanted to play soccer with his sister, [Rebecca]. [Rebecca] and her mother [Dorothy] attended a play at the theater. [Dorothy] took her daughter, [Rebecca], to lunch.
('Roberto', 'Rebecca')
[Roberto] wanted to go swimming with her brother, [Jeffrey]. [Jeffrey], however, was n't interested as he wanted to play soccer with his sister, [Rebecca]. [Dorothy] took her daughter, [Rebecca], to lunch. [Rebecca] and her mother [Dorothy] attended a play at the theater.
[{('Roberto', 'sister', 'Rebecca'): [('Roberto', 'mother', 'Dorothy'), ('Dorothy', 'daughter', 'Rebecca')]}, {('Roberto', 'mother', 'Dorothy'): [('Roberto', 'brother', 'Jeffrey'), ('Jeffrey', 'mother', 'Dorothy')]}, {('Jeffrey', 'mother', 'Dorothy'): [('Jeffrey', 'sister', 'Rebecca'), ('Rebecca', 'mother', 'Dorothy')]}]
['brother', 'sister', 'mother', 'daughter']