[Wesley] stepped out with his son [Charles] to pick up [Charles]'s sister [Pamela] and her grandmother [Frances] at the mall.
('Wesley', 'Frances')
[Wesley] stepped out with his son [Charles] to pick up [Charles]'s sister [Pamela] and her grandmother [Frances] at the mall.
[{('Wesley', 'mother', 'Frances'): [('Wesley', 'daughter', 'Pamela'), ('Pamela', 'grandmother', 'Frances')]}, {('Wesley', 'daughter', 'Pamela'): [('Wesley', 'son', 'Charles'), ('Charles', 'sister', 'Pamela')]}]
['son', 'sister', 'grandmother']