[Pedro] bought a book for his father [Harold]. [Beverly] invited her sisters [Marie] and [Tracy] out for lunch. [Marie]'s brother [Pedro] does n't get along with [Beverly] and did n't join them.
('Harold', 'Tracy')
[Pedro] bought a book for his father [Harold]. [Beverly] invited her sisters [Marie] and [Tracy] out for lunch. [Marie]'s brother [Pedro] does n't get along with [Beverly] and did n't join them.
[{('Harold', 'daughter', 'Tracy'): [('Harold', 'daughter', 'Beverly'), ('Beverly', 'sister', 'Tracy')]}, {('Harold', 'daughter', 'Beverly'): [('Harold', 'son', 'Pedro'), ('Pedro', 'sister', 'Beverly')]}, {('Pedro', 'sister', 'Beverly'): [('Pedro', 'sister', 'Marie'), ('Marie', 'sister', 'Beverly')]}]
['son', 'sister', 'sister', 'sister']