[Jerome]'s grandfather [Harold] is going to [Jerome]'s birthday party. [Pedro] took his son, [Jerome], to the library as his sister, [Beverly], waited at home for her brother, [Robert].
('Robert', 'Harold')
[Pedro] took his son, [Jerome], to the library as his sister, [Beverly], waited at home for her brother, [Robert]. [Jerome]'s grandfather [Harold] is going to [Jerome]'s birthday party.
[{('Robert', 'father', 'Harold'): [('Robert', 'brother', 'Pedro'), ('Pedro', 'father', 'Harold')]}, {('Pedro', 'father', 'Harold'): [('Pedro', 'son', 'Jerome'), ('Jerome', 'grandfather', 'Harold')]}, {('Robert', 'brother', 'Pedro'): [('Robert', 'sister', 'Beverly'), ('Beverly', 'brother', 'Pedro')]}]
['sister', 'brother', 'son', 'grandfather']