[Constance] went shopping for makeup with her sister [Martha]. [Constance]'s son [Newton] stayed at home.
('Martha', 'Newton')
[Constance] went shopping for makeup with her sister [Martha]. [Constance]'s son [Newton] stayed at home.
[{('Martha', 'nephew', 'Newton'): [('Martha', 'sister', 'Constance'), ('Constance', 'son', 'Newton')]}]