[Clarence] had strict rules for his daughter [Nancy] growing up but that did n't prevent her from having her son [Robert] at a young age.
('Robert', 'Clarence')
[Clarence] had strict rules for his daughter [Nancy] growing up but that did n't prevent her from having her son [Robert] at a young age.
[{('Robert', 'grandfather', 'Clarence'): [('Robert', 'mother', 'Nancy'), ('Nancy', 'father', 'Clarence')]}]
['mother', 'father']