[David] likes taking her son [Bobby] to school. [Cindy] went to dinner with her brother [Hugh], who brought along her son [Bobby].
('David', 'Cindy')
[David] likes taking her son [Bobby] to school. [Cindy] went to dinner with her brother [Hugh], who brought along her son [Bobby].
[{('David', 'sister', 'Cindy'): [('David', 'son', 'Bobby'), ('Bobby', 'aunt', 'Cindy')]}, {('Bobby', 'aunt', 'Cindy'): [('Bobby', 'father', 'Hugh'), ('Hugh', 'sister', 'Cindy')]}]
['son', 'father', 'sister']