[Robert] made a sandwich for his son [Ronald]. [Ronald]'s brother [Mario] ate an apple instead. [Harold] and [Shantel] got married last fall. After 1 year of marriage, [Shantel] gave birth to her first child [Robert].
('Harold', 'Mario')
[Harold] and [Shantel] got married last fall. After 1 year of marriage, [Shantel] gave birth to her first child [Robert]. [Robert] made a sandwich for his son [Ronald]. [Ronald]'s brother [Mario] ate an apple instead.
[{('Harold', 'grandson', 'Mario'): [('Harold', 'son', 'Robert'), ('Robert', 'son', 'Mario')]}, {('Harold', 'son', 'Robert'): [('Harold', 'wife', 'Shantel'), ('Shantel', 'son', 'Robert')]}, {('Robert', 'son', 'Mario'): [('Robert', 'son', 'Ronald'), ('Ronald', 'brother', 'Mario')]}]
['wife', 'son', 'son', 'brother']