[Robert] is a factory worker. He has a wonderful sister by the name of [Beverly]. [Harold] took his daughters [Beverly] and [Tracy] to lunch one day. [Tracy] had to bring her daughter [Erika]. She was so up to see [Tracy]'s sister.
('Robert', 'Erika')
[Robert] is a factory worker. He has a wonderful sister by the name of [Beverly]. [Harold] took his daughters [Beverly] and [Tracy] to lunch one day. [Tracy] had to bring her daughter [Erika]. She was so up to see [Tracy]'s sister.
[{('Robert', 'niece', 'Erika'): [('Robert', 'sister', 'Tracy'), ('Tracy', 'daughter', 'Erika')]}, {('Robert', 'sister', 'Tracy'): [('Robert', 'father', 'Harold'), ('Harold', 'daughter', 'Tracy')]}, {('Robert', 'father', 'Harold'): [('Robert', 'sister', 'Beverly'), ('Beverly', 'father', 'Harold')]}]
['sister', 'father', 'daughter', 'daughter']