[Helen] took her sister [Katherine] out for dinner to celebrate her birthday. [Katherine]'s nephew [Lionel] is going with her to town. [Lionel]'s father [Matthew] is going to coach the team this year.
('Matthew', 'Helen')
[Lionel]'s father [Matthew] is going to coach the team this year. [Katherine]'s nephew [Lionel] is going with her to town. [Helen] took her sister [Katherine] out for dinner to celebrate her birthday.
[{('Matthew', 'sister', 'Helen'): [('Matthew', 'sister', 'Katherine'), ('Katherine', 'sister', 'Helen')]}, {('Matthew', 'sister', 'Katherine'): [('Matthew', 'son', 'Lionel'), ('Lionel', 'aunt', 'Katherine')]}]