[Bobby] and his brother [Bernardo] played at jacks. [Bernardo]'s father, [Antonio], took his son to the movies. [Robert], [Antonio]'s brother, met them there. [Robert]'s father, [Harold], bought him some ice cream.
('Bobby', 'Harold')
[Bobby] and his brother [Bernardo] played at jacks. [Bernardo]'s father, [Antonio], took his son to the movies. [Robert], [Antonio]'s brother, met them there. [Robert]'s father, [Harold], bought him some ice cream.
[{('Bobby', 'grandfather', 'Harold'): [('Bobby', 'father', 'Antonio'), ('Antonio', 'father', 'Harold')]}, {('Antonio', 'father', 'Harold'): [('Antonio', 'brother', 'Robert'), ('Robert', 'father', 'Harold')]}, {('Bobby', 'father', 'Antonio'): [('Bobby', 'brother', 'Bernardo'), ('Bernardo', 'father', 'Antonio')]}]
['brother', 'father', 'brother', 'father']