[Douglas] was playing his sister [Janet]. Suddenly, [Janet]'s mother [Lillian] called her to come upstairs right away.
('Douglas', 'Lillian')
[Douglas] was playing his sister [Janet]. Suddenly, [Janet]'s mother [Lillian] called her to come upstairs right away.
[{('Douglas', 'mother', 'Lillian'): [('Douglas', 'sister', 'Janet'), ('Janet', 'mother', 'Lillian')]}]
['sister', 'mother']