[Roberto]'s grandfather, [Harold], picked him up from school. [Jeffrey]'s sister [Rebecca] asked him for some help planting her garden. [Jeffrey]'s mother [Dorothy] made a cake for his birthday and her other son [Roberto] ate a piece of it.
('Rebecca', 'Harold')
[Jeffrey]'s sister [Rebecca] asked him for some help planting her garden. [Jeffrey]'s mother [Dorothy] made a cake for his birthday and her other son [Roberto] ate a piece of it. [Roberto]'s grandfather, [Harold], picked him up from school.
[{('Rebecca', 'grandfather', 'Harold'): [('Rebecca', 'mother', 'Dorothy'), ('Dorothy', 'father', 'Harold')]}, {('Dorothy', 'father', 'Harold'): [('Dorothy', 'son', 'Roberto'), ('Roberto', 'grandfather', 'Harold')]}, {('Rebecca', 'mother', 'Dorothy'): [('Rebecca', 'brother', 'Jeffrey'), ('Jeffrey', 'mother', 'Dorothy')]}]
['brother', 'mother', 'son', 'grandfather']