[Robert] and his sister [Tracy] were twins. Still, they did n't look very much alike. [Beverly] and her sister, [Tracy], made a cake for [Beverly]'s son [Michael]. [Michael]'s grandmother, [Shantel], ended up eating the entire cake.
('Robert', 'Shantel')
[Robert] and his sister [Tracy] were twins. Still, they did n't look very much alike. [Beverly] and her sister, [Tracy], made a cake for [Beverly]'s son [Michael]. [Michael]'s grandmother, [Shantel], ended up eating the entire cake.
[{('Robert', 'mother', 'Shantel'): [('Robert', 'sister', 'Tracy'), ('Tracy', 'mother', 'Shantel')]}, {('Tracy', 'mother', 'Shantel'): [('Tracy', 'sister', 'Beverly'), ('Beverly', 'mother', 'Shantel')]}, {('Beverly', 'mother', 'Shantel'): [('Beverly', 'son', 'Michael'), ('Michael', 'grandmother', 'Shantel')]}]
['sister', 'sister', 'son', 'grandmother']