[Michael] loves spending time with his uncle [Robert]. [Louis] invited his brother [Pedro] and sister [Marie] to a concert. [Louis]'s son [Michael] was not interested in going.
('Pedro', 'Robert')
[Louis] invited his brother [Pedro] and sister [Marie] to a concert. [Louis]'s son [Michael] was not interested in going. [Michael] loves spending time with his uncle [Robert].
[{('Pedro', 'brother', 'Robert'): [('Pedro', 'brother', 'Louis'), ('Louis', 'brother', 'Robert')]}, {('Louis', 'brother', 'Robert'): [('Louis', 'son', 'Michael'), ('Michael', 'uncle', 'Robert')]}, {('Pedro', 'brother', 'Louis'): [('Pedro', 'sister', 'Marie'), ('Marie', 'brother', 'Louis')]}]
['sister', 'brother', 'son', 'uncle']