[Louis] is in the sixth grade. He looks up to his sister [Tracy], who is in the seventh. [Roberto]'s sister [Rebecca] is cooking dinner. [Rebecca]'s mother [Dorothy] and her brother [Louis] are coming for dinner.
('Roberto', 'Tracy')
[Roberto]'s sister [Rebecca] is cooking dinner. [Rebecca]'s mother [Dorothy] and her brother [Louis] are coming for dinner. [Louis] is in the sixth grade. He looks up to his sister [Tracy], who is in the seventh.
[{('Roberto', 'aunt', 'Tracy'): [('Roberto', 'mother', 'Dorothy'), ('Dorothy', 'sister', 'Tracy')]}, {('Dorothy', 'sister', 'Tracy'): [('Dorothy', 'brother', 'Louis'), ('Louis', 'sister', 'Tracy')]}, {('Roberto', 'mother', 'Dorothy'): [('Roberto', 'sister', 'Rebecca'), ('Rebecca', 'mother', 'Dorothy')]}]
['sister', 'mother', 'brother', 'sister']