[Marie] is taking a trip to see her sister [Dorothy]. Last night, [Tracy] went out with her sister [Dorothy], accompanied by [Tracy]'s daughter [Emma]. [Pedro] took his niece [Emma] to the park to walk her dog.
('Marie', 'Pedro')
[Marie] is taking a trip to see her sister [Dorothy]. Last night, [Tracy] went out with her sister [Dorothy], accompanied by [Tracy]'s daughter [Emma]. [Pedro] took his niece [Emma] to the park to walk her dog.
[{('Marie', 'brother', 'Pedro'): [('Marie', 'sister', 'Tracy'), ('Tracy', 'brother', 'Pedro')]}, {('Marie', 'sister', 'Tracy'): [('Marie', 'sister', 'Dorothy'), ('Dorothy', 'sister', 'Tracy')]}, {('Tracy', 'brother', 'Pedro'): [('Tracy', 'daughter', 'Emma'), ('Emma', 'uncle', 'Pedro')]}]
['sister', 'sister', 'daughter', 'uncle']