[Hugh] and his son [Bobby] went to the skating rink. [Hugh] has been with [David] for 10 years. [David] has been married for two years. [Marie] and her mother [David] attended a play at the theater.
('Bobby', 'Marie')
[Hugh] and his son [Bobby] went to the skating rink. [Hugh] has been with [David] for 10 years. [David] has been married for two years. [Marie] and her mother [David] attended a play at the theater.
[{('Bobby', 'sister', 'Marie'): [('Bobby', 'father', 'Hugh'), ('Hugh', 'daughter', 'Marie')]}, {('Hugh', 'daughter', 'Marie'): [('Hugh', 'wife', 'David'), ('David', 'daughter', 'Marie')]}]
['father', 'wife', 'daughter']