[Antonio] loves his mother [Shantel] very much. [Beverly] met her brother, [Robert], for dinner. [Robert] was sad his father, [Shantel], could n't be there. [Beverly]'s brother [Pedro] was going to be the star in the new show.
('Antonio', 'Pedro')
[Antonio] loves his mother [Shantel] very much. [Beverly] met her brother, [Robert], for dinner. [Robert] was sad his father, [Shantel], could n't be there. [Beverly]'s brother [Pedro] was going to be the star in the new show.
[{('Antonio', 'brother', 'Pedro'): [('Antonio', 'brother', 'Robert'), ('Robert', 'brother', 'Pedro')]}, {('Robert', 'brother', 'Pedro'): [('Robert', 'sister', 'Beverly'), ('Beverly', 'brother', 'Pedro')]}, {('Antonio', 'brother', 'Robert'): [('Antonio', 'mother', 'Shantel'), ('Shantel', 'son', 'Robert')]}]
['mother', 'son', 'sister', 'brother']