[Ashley] took her grandson, [Douglas], to the zoo. [Douglas]'s sister, [Janet], had to stay home because she was sick.
('Ashley', 'Janet')
[Ashley] took her grandson, [Douglas], to the zoo. [Douglas]'s sister, [Janet], had to stay home because she was sick.
[{('Ashley', 'granddaughter', 'Janet'): [('Ashley', 'grandson', 'Douglas'), ('Douglas', 'sister', 'Janet')]}]
['grandson', 'sister']