[Francisco] took his sons [Pete] and [Leonard] to the park last weekend. [David] who is David´s sister also went.
('Leonard', 'David')
[Francisco] took his sons [Pete] and [Leonard] to the park last weekend. [David] who is David´s sister also went.
[{('Leonard', 'aunt', 'David'): [('Leonard', 'father', 'Francisco'), ('Francisco', 'sister', 'David')]}, {('Leonard', 'father', 'Francisco'): [('Leonard', 'brother', 'Pete'), ('Pete', 'father', 'Francisco')]}]
['brother', 'father', 'sister']