[James] was present in the delivery room when his daughter [David] was born, but when his daughter [Cindy] was born he was too sick. [Joshua] and his sister [Cindy] were twins. Still, they did n't look very much alike.
('Joshua', 'David')
[Joshua] and his sister [Cindy] were twins. Still, they did n't look very much alike. [James] was present in the delivery room when his daughter [David] was born, but when his daughter [Cindy] was born he was too sick.
[{('Joshua', 'sister', 'David'): [('Joshua', 'sister', 'Cindy'), ('Cindy', 'sister', 'David')]}, {('Cindy', 'sister', 'David'): [('Cindy', 'father', 'James'), ('James', 'daughter', 'David')]}]
['sister', 'father', 'daughter']