[Kevin] asked his father [Antonio] if they could go to the library. [Antonio]'s father [Harold] was there already, waiting for them. [Kevin] loves his sister, [Laura] very much. [Laura] is just like her sister, [Erika].
('Erika', 'Harold')
[Kevin] loves his sister, [Laura] very much. [Laura] is just like her sister, [Erika]. [Kevin] asked his father [Antonio] if they could go to the library. [Antonio]'s father [Harold] was there already, waiting for them.
[{('Erika', 'grandfather', 'Harold'): [('Erika', 'sister', 'Laura'), ('Laura', 'grandfather', 'Harold')]}, {('Laura', 'grandfather', 'Harold'): [('Laura', 'father', 'Antonio'), ('Antonio', 'father', 'Harold')]}, {('Laura', 'father', 'Antonio'): [('Laura', 'brother', 'Kevin'), ('Kevin', 'father', 'Antonio')]}]
['sister', 'brother', 'father', 'father']