[Robert] took his sister [Tracy] to the movies with him to see the new Star Wars film. [Jeffrey] and [Roberto] are brothers who look nothing alike. [Jeffrey] did n't think his dad, [Pedro] had time to help with homework. [Pedro] was busy fixing his brother [Robert]'s truck.
('Roberto', 'Tracy')
[Jeffrey] and [Roberto] are brothers who look nothing alike. [Jeffrey] did n't think his dad, [Pedro] had time to help with homework. [Pedro] was busy fixing his brother [Robert]'s truck. [Robert] took his sister [Tracy] to the movies with him to see the new Star Wars film.
[{('Roberto', 'aunt', 'Tracy'): [('Roberto', 'father', 'Pedro'), ('Pedro', 'sister', 'Tracy')]}, {('Pedro', 'sister', 'Tracy'): [('Pedro', 'brother', 'Robert'), ('Robert', 'sister', 'Tracy')]}, {('Roberto', 'father', 'Pedro'): [('Roberto', 'brother', 'Jeffrey'), ('Jeffrey', 'father', 'Pedro')]}]
['brother', 'father', 'brother', 'sister']