[Robert] left for work, leaving his wife [Marie] at home with their young son, [Ronald]. On his way to work, [Robert] dropped his other son, [Mario], off at school. [Marie] could n't wait for her father, [Harold], to see the gift she bought for him.
('Mario', 'Harold')
[Robert] left for work, leaving his wife [Marie] at home with their young son, [Ronald]. On his way to work, [Robert] dropped his other son, [Mario], off at school. [Marie] could n't wait for her father, [Harold], to see the gift she bought for him.
[{('Mario', 'grandfather', 'Harold'): [('Mario', 'mother', 'Marie'), ('Marie', 'father', 'Harold')]}, {('Mario', 'mother', 'Marie'): [('Mario', 'brother', 'Ronald'), ('Ronald', 'mother', 'Marie')]}, {('Mario', 'brother', 'Ronald'): [('Mario', 'father', 'Robert'), ('Robert', 'son', 'Ronald')]}]
['father', 'son', 'mother', 'father']