[Dennis] and his sister [Jennifer] are going for a walk. [Jennifer] needed to ask her father [Nicholas] for a loan.
('Dennis', 'Nicholas')
[Dennis] and his sister [Jennifer] are going for a walk. [Jennifer] needed to ask her father [Nicholas] for a loan.
[{('Dennis', 'father', 'Nicholas'): [('Dennis', 'sister', 'Jennifer'), ('Jennifer', 'father', 'Nicholas')]}]
['sister', 'father']