[James] and his mother, [Dorothy], went to the zoo. Meanwhile, [James]'s son, [Pedro], and [Dorothy]'s son, [Jeffrey], went to the race track. [Beverly]'s brother [Pedro] was going to be the star in the new show.
('Beverly', 'Jeffrey')
[Beverly]'s brother [Pedro] was going to be the star in the new show. [James] and his mother, [Dorothy], went to the zoo. Meanwhile, [James]'s son, [Pedro], and [Dorothy]'s son, [Jeffrey], went to the race track.
[{('Beverly', 'nephew', 'Jeffrey'): [('Beverly', 'brother', 'Pedro'), ('Pedro', 'son', 'Jeffrey')]}, {('Pedro', 'son', 'Jeffrey'): [('Pedro', 'son', 'James'), ('James', 'brother', 'Jeffrey')]}, {('James', 'brother', 'Jeffrey'): [('James', 'mother', 'Dorothy'), ('Dorothy', 'son', 'Jeffrey')]}]
['brother', 'son', 'mother', 'son']