[Ashley]'s grandson [Timothy] was playing in the pool with his sister [Janet].
('Ashley', 'Janet')
[Ashley]'s grandson [Timothy] was playing in the pool with his sister [Janet].
[{('Ashley', 'granddaughter', 'Janet'): [('Ashley', 'grandson', 'Timothy'), ('Timothy', 'sister', 'Janet')]}]
['grandson', 'sister']