[John] and his sister [Helen] were hoping for a snow day. [Matthew] went to his sister, [Helen]'s, house for dinner. He brought along his daughter [Sandy].
('John', 'Sandy')
[John] and his sister [Helen] were hoping for a snow day. [Matthew] went to his sister, [Helen]'s, house for dinner. He brought along his daughter [Sandy].
[{('John', 'niece', 'Sandy'): [('John', 'brother', 'Matthew'), ('Matthew', 'daughter', 'Sandy')]}, {('John', 'brother', 'Matthew'): [('John', 'sister', 'Helen'), ('Helen', 'brother', 'Matthew')]}]