[Louis] and his sister [Marie] walked to school together every day, since they only lived two blocks away from the school. [Karen] misses her father [Louis] when she is at school. [Beverly] and her sister [Tracy] went out to lunch with [Beverly]'s sister [Marie].
('Karen', 'Tracy')
[Karen] misses her father [Louis] when she is at school. [Louis] and his sister [Marie] walked to school together every day, since they only lived two blocks away from the school. [Beverly] and her sister [Tracy] went out to lunch with [Beverly]'s sister [Marie].
[{('Karen', 'aunt', 'Tracy'): [('Karen', 'father', 'Louis'), ('Louis', 'sister', 'Tracy')]}, {('Louis', 'sister', 'Tracy'): [('Louis', 'sister', 'Marie'), ('Marie', 'sister', 'Tracy')]}, {('Marie', 'sister', 'Tracy'): [('Marie', 'sister', 'Beverly'), ('Beverly', 'sister', 'Tracy')]}]
['father', 'sister', 'sister', 'sister']