[Beverly] and her sister [Marie] are going to the movies. [Michael] is staying home, but ca n't wait until his mother [Beverly] gets back. [Marie] took her son [John] shopping for new school clothes. They had a good time. [Michael] could n't wait to introduce his new son to his uncle, [Pedro].
('John', 'Pedro')
[Marie] took her son [John] shopping for new school clothes. They had a good time. [Beverly] and her sister [Marie] are going to the movies. [Michael] is staying home, but ca n't wait until his mother [Beverly] gets back. [Michael] could n't wait to introduce his new son to his uncle, [Pedro].
[{('John', 'uncle', 'Pedro'): [('John', 'mother', 'Marie'), ('Marie', 'brother', 'Pedro')]}, {('Marie', 'brother', 'Pedro'): [('Marie', 'sister', 'Beverly'), ('Beverly', 'brother', 'Pedro')]}, {('Beverly', 'brother', 'Pedro'): [('Beverly', 'son', 'Michael'), ('Michael', 'uncle', 'Pedro')]}]
['mother', 'sister', 'son', 'uncle']