[Jerome] invited his uncle [Robert] to dinner [Robert] went to the park with his father, [Harold]. [Louis] met his brother [Pedro] for drinks after work. [Pedro] took his son [Jerome] to soccer practice.
('Louis', 'Harold')
[Louis] met his brother [Pedro] for drinks after work. [Pedro] took his son [Jerome] to soccer practice. [Jerome] invited his uncle [Robert] to dinner [Robert] went to the park with his father, [Harold].
[{('Louis', 'father', 'Harold'): [('Louis', 'brother', 'Robert'), ('Robert', 'father', 'Harold')]}, {('Louis', 'brother', 'Robert'): [('Louis', 'brother', 'Pedro'), ('Pedro', 'brother', 'Robert')]}, {('Pedro', 'brother', 'Robert'): [('Pedro', 'son', 'Jerome'), ('Jerome', 'uncle', 'Robert')]}]
['brother', 'son', 'uncle', 'father']