[Clarence] took his grandson, [Douglas], to Disney for a nice summer vacation trip full of fun and cheer. [Douglas] was sad to learn that his sister [Janet] was not going to make it to dinner like they had planned.
('Clarence', 'Janet')
[Clarence] took his grandson, [Douglas], to Disney for a nice summer vacation trip full of fun and cheer. [Douglas] was sad to learn that his sister [Janet] was not going to make it to dinner like they had planned.
[{('Clarence', 'granddaughter', 'Janet'): [('Clarence', 'grandson', 'Douglas'), ('Douglas', 'sister', 'Janet')]}]
['grandson', 'sister']