[Francisco] made a grilled cheese for his son [Wayne]. [Wayne]'s brother [Richard] ate a salad. [Leonard] went to the park with his father, [Francisco].
('Leonard', 'Richard')
[Leonard] went to the park with his father, [Francisco]. [Francisco] made a grilled cheese for his son [Wayne]. [Wayne]'s brother [Richard] ate a salad.
[{('Leonard', 'brother', 'Richard'): [('Leonard', 'father', 'Francisco'), ('Francisco', 'son', 'Richard')]}, {('Francisco', 'son', 'Richard'): [('Francisco', 'son', 'Wayne'), ('Wayne', 'brother', 'Richard')]}]
['father', 'son', 'brother']