[Robert] and his wife [Marie] washed the car with their son [Ronald]. [Marie]'s son [Allan] did n't help at all. [Allan] was happy to see his aunt [Dorothy].
('Ronald', 'Dorothy')
[Robert] and his wife [Marie] washed the car with their son [Ronald]. [Marie]'s son [Allan] did n't help at all. [Allan] was happy to see his aunt [Dorothy].
[{('Ronald', 'aunt', 'Dorothy'): [('Ronald', 'mother', 'Marie'), ('Marie', 'sister', 'Dorothy')]}, {('Marie', 'sister', 'Dorothy'): [('Marie', 'son', 'Allan'), ('Allan', 'aunt', 'Dorothy')]}, {('Marie', 'son', 'Allan'): [('Marie', 'husband', 'Robert'), ('Robert', 'son', 'Allan')]}]
['mother', 'husband', 'son', 'aunt']