[Mary] and her sister [Jennifer] braided each other's hair before school. [Mary]'s father is named [Nicholas].
('Jennifer', 'Nicholas')
[Mary] and her sister [Jennifer] braided each other's hair before school. [Mary]'s father is named [Nicholas].
[{('Jennifer', 'father', 'Nicholas'): [('Jennifer', 'sister', 'Mary'), ('Mary', 'father', 'Nicholas')]}]
['sister', 'father']