[Pedro] took his nephew [Mario] to the park to teach him how to ride a bike. [Mario] and his father [Robert] went jogging by the lake. [Harold] and his son [Robert] went to the store. [Harold] asked his daughter [Tracy] if she needed anything.
('Tracy', 'Pedro')
[Harold] and his son [Robert] went to the store. [Harold] asked his daughter [Tracy] if she needed anything. [Mario] and his father [Robert] went jogging by the lake. [Pedro] took his nephew [Mario] to the park to teach him how to ride a bike.
[{('Tracy', 'brother', 'Pedro'): [('Tracy', 'brother', 'Robert'), ('Robert', 'brother', 'Pedro')]}, {('Tracy', 'brother', 'Robert'): [('Tracy', 'father', 'Harold'), ('Harold', 'son', 'Robert')]}, {('Robert', 'brother', 'Pedro'): [('Robert', 'son', 'Mario'), ('Mario', 'uncle', 'Pedro')]}]
['father', 'son', 'son', 'uncle']