[Wilhelmina] invited her mother, [Cindy], to dinner and extended the invitation to [Cindy]'s son, [Pete]. [Pete] and his brother [Leonard] went out for lunch. [Pete] had a burger, and [Leonard] had a chicken sandwich.
('Wilhelmina', 'Leonard')
[Wilhelmina] invited her mother, [Cindy], to dinner and extended the invitation to [Cindy]'s son, [Pete]. [Pete] and his brother [Leonard] went out for lunch. [Pete] had a burger, and [Leonard] had a chicken sandwich.
[{('Wilhelmina', 'brother', 'Leonard'): [('Wilhelmina', 'mother', 'Cindy'), ('Cindy', 'son', 'Leonard')]}, {('Cindy', 'son', 'Leonard'): [('Cindy', 'son', 'Pete'), ('Pete', 'brother', 'Leonard')]}]
['mother', 'son', 'brother']