[Glen] likes playing catch with his sister [Emily], but his brother [Michael] never wants to play.
('Emily', 'Michael')
[Glen] likes playing catch with his sister [Emily], but his brother [Michael] never wants to play.
[{('Emily', 'brother', 'Michael'): [('Emily', 'brother', 'Glen'), ('Glen', 'brother', 'Michael')]}]
['brother', 'brother']