[Bret]'s aunt, [Helen], was ten minutes late to his baseball game. [Alma] was talking about food with her sister [Katherine]. [Katherine] baked a cake for her son [Bret].
('Alma', 'Helen')
[Alma] was talking about food with her sister [Katherine]. [Katherine] baked a cake for her son [Bret]. [Bret]'s aunt, [Helen], was ten minutes late to his baseball game.
[{('Alma', 'sister', 'Helen'): [('Alma', 'sister', 'Katherine'), ('Katherine', 'sister', 'Helen')]}, {('Katherine', 'sister', 'Helen'): [('Katherine', 'son', 'Bret'), ('Bret', 'aunt', 'Helen')]}]