[Dorothy] was sewing a sweater for her sister [Marie]. [Tracy]'s sister, [Dorothy], recently started acting. [Louis] and his daughter, [Karen] go to concerts every week. [Louis] took his sister [Tracy] out to dinner for her birthday.
('Marie', 'Karen')
[Dorothy] was sewing a sweater for her sister [Marie]. [Tracy]'s sister, [Dorothy], recently started acting. [Louis] took his sister [Tracy] out to dinner for her birthday. [Louis] and his daughter, [Karen] go to concerts every week.
[{('Marie', 'niece', 'Karen'): [('Marie', 'brother', 'Louis'), ('Louis', 'daughter', 'Karen')]}, {('Marie', 'brother', 'Louis'): [('Marie', 'sister', 'Tracy'), ('Tracy', 'brother', 'Louis')]}, {('Marie', 'sister', 'Tracy'): [('Marie', 'sister', 'Dorothy'), ('Dorothy', 'sister', 'Tracy')]}]
['sister', 'sister', 'brother', 'daughter']