[Theresa] was unhappy with her son, [Nicolas], and his grades. She enlisted a tutor to help him. [Theresa] went with her brother [Nicholas] to the mall to buy some new candles.
('Nicholas', 'Nicolas')
[Theresa] went with her brother [Nicholas] to the mall to buy some new candles. [Theresa] was unhappy with her son, [Nicolas], and his grades. She enlisted a tutor to help him.
[{('Nicholas', 'nephew', 'Nicolas'): [('Nicholas', 'sister', 'Theresa'), ('Theresa', 'son', 'Nicolas')]}]
['sister', 'son']