[Amy] visited her son [Dennis] at college. [Amy] and her daughter [Jennifer] were on vaction.
('Jennifer', 'Dennis')
[Amy] and her daughter [Jennifer] were on vaction. [Amy] visited her son [Dennis] at college.
[{('Jennifer', 'brother', 'Dennis'): [('Jennifer', 'mother', 'Amy'), ('Amy', 'son', 'Dennis')]}]
['mother', 'son']