[Dorothea] went dancing with her mother, [Helen], and her sister, [Crystal]. [Crystal]'s husband, [Richard], stayed at home.
('Richard', 'Helen')
[Dorothea] went dancing with her mother, [Helen], and her sister, [Crystal]. [Crystal]'s husband, [Richard], stayed at home.
[{('Richard', 'mother-in-law', 'Helen'): [('Richard', 'wife', 'Crystal'), ('Crystal', 'mother', 'Helen')]}, {('Crystal', 'mother', 'Helen'): [('Crystal', 'sister', 'Dorothea'), ('Dorothea', 'mother', 'Helen')]}]