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