[Beverly] gave her brother [Robert] a new sweater for Christmas. [Robert] took his sons [Ronald] and [Mario] to a baseball game. [Mario] invited his grandfather [Harold] to join them.
('Beverly', 'Harold')
[Beverly] gave her brother [Robert] a new sweater for Christmas. [Robert] took his sons [Ronald] and [Mario] to a baseball game. [Mario] invited his grandfather [Harold] to join them.
[{('Beverly', 'father', 'Harold'): [('Beverly', 'brother', 'Robert'), ('Robert', 'father', 'Harold')]}, {('Robert', 'father', 'Harold'): [('Robert', 'son', 'Mario'), ('Mario', 'grandfather', 'Harold')]}, {('Robert', 'son', 'Mario'): [('Robert', 'son', 'Ronald'), ('Ronald', 'brother', 'Mario')]}]
['brother', 'son', 'brother', 'grandfather']