[Karen] went to the store with her sister [Jennifer]. Later that day, [Karen] had tea with her sister [Nettie]. [Samuel] took his sister [Karen] out to dinner for her birthday. [Jennifer] is looking for a good gift for her sister [Karen].
('Nettie', 'Samuel')
[Karen] went to the store with her sister [Jennifer]. Later that day, [Karen] had tea with her sister [Nettie]. [Jennifer] is looking for a good gift for her sister [Karen]. [Samuel] took his sister [Karen] out to dinner for her birthday.
[{('Nettie', 'brother', 'Samuel'): [('Nettie', 'sister', 'Jennifer'), ('Jennifer', 'brother', 'Samuel')]}, {('Nettie', 'sister', 'Jennifer'): [('Nettie', 'sister', 'Karen'), ('Karen', 'sister', 'Jennifer')]}, {('Jennifer', 'brother', 'Samuel'): [('Jennifer', 'sister', 'Karen'), ('Karen', 'brother', 'Samuel')]}]
['sister', 'sister', 'sister', 'brother']