[Dennis] and her sister [Mary] are planning on a short vacation. They are planning on visiting their mother [Amy] in London for Spring break.
('Dennis', 'Amy')
[Dennis] and her sister [Mary] are planning on a short vacation. They are planning on visiting their mother [Amy] in London for Spring break.
[{('Dennis', 'mother', 'Amy'): [('Dennis', 'sister', 'Mary'), ('Mary', 'mother', 'Amy')]}]
['sister', 'mother']