[Amy] often wondered why her son, [Dennis], went down the path of drinking and doing drugs, whilst her daughter [Mary] was an honor role student.
('Dennis', 'Mary')
[Amy] often wondered why her son, [Dennis], went down the path of drinking and doing drugs, whilst her daughter [Mary] was an honor role student.
[{('Dennis', 'sister', 'Mary'): [('Dennis', 'mother', 'Amy'), ('Amy', 'daughter', 'Mary')]}]
['mother', 'daughter']