[Mario]'s mother [Marie] was present at the thanksgiving service. [Marie] asked her father [Harold] for some money to go out this weekend. [Robert] made a grilled cheese for his son [Ronald]. [Ronald]'s brother [Mario] ate a salad.
('Robert', 'Harold')
[Robert] made a grilled cheese for his son [Ronald]. [Ronald]'s brother [Mario] ate a salad. [Mario]'s mother [Marie] was present at the thanksgiving service. [Marie] asked her father [Harold] for some money to go out this weekend.
[{('Robert', 'father', 'Harold'): [('Robert', 'son', 'Ronald'), ('Ronald', 'grandfather', 'Harold')]}, {('Ronald', 'grandfather', 'Harold'): [('Ronald', 'brother', 'Mario'), ('Mario', 'grandfather', 'Harold')]}, {('Mario', 'grandfather', 'Harold'): [('Mario', 'mother', 'Marie'), ('Marie', 'father', 'Harold')]}]
['son', 'brother', 'mother', 'father']