[Pete]'s mother [Cindy] baked brownies for dessert after they had dinner. [Hugh] often goes out for lunch with his sister, [Lynn]. [Hugh] and his sister [Cindy] went to brunch today at the new diner.
('Pete', 'Lynn')
[Pete]'s mother [Cindy] baked brownies for dessert after they had dinner. [Hugh] and his sister [Cindy] went to brunch today at the new diner. [Hugh] often goes out for lunch with his sister, [Lynn].
[{('Pete', 'aunt', 'Lynn'): [('Pete', 'mother', 'Cindy'), ('Cindy', 'sister', 'Lynn')]}, {('Cindy', 'sister', 'Lynn'): [('Cindy', 'brother', 'Hugh'), ('Hugh', 'sister', 'Lynn')]}]
['mother', 'brother', 'sister']