[Bobby] has a sister who has a son. The son is named [Joshua]. [Hugh] took is son [Bobby] and mother [Frances] out to a lovely summer brunch.
('Frances', 'Joshua')
[Hugh] took is son [Bobby] and mother [Frances] out to a lovely summer brunch. [Bobby] has a sister who has a son. The son is named [Joshua].
[{('Frances', 'son', 'Joshua'): [('Frances', 'son', 'Hugh'), ('Hugh', 'brother', 'Joshua')]}, {('Hugh', 'brother', 'Joshua'): [('Hugh', 'son', 'Bobby'), ('Bobby', 'uncle', 'Joshua')]}]
['son', 'son', 'uncle']