[Nancy] gave her brother [Nicholas] a new sweater for Christmas. [George] and his sister [Nancy] got their mother [Nancy] a new computer for her birthday. She really liked it.
('George', 'Nicholas')
[George] and his sister [Nancy] got their mother [Nancy] a new computer for her birthday. She really liked it. [Nancy] gave her brother [Nicholas] a new sweater for Christmas.
[{('George', 'brother', 'Nicholas'): [('George', 'sister', 'Nancy'), ('Nancy', 'brother', 'Nicholas')]}]
['sister', 'brother']