[Jeff] likes playing catch with his sister [Lorraine], but his brother [Jacob] never wants to play.
('Lorraine', 'Jacob')
[Jeff] likes playing catch with his sister [Lorraine], but his brother [Jacob] never wants to play.
[{('Lorraine', 'brother', 'Jacob'): [('Lorraine', 'brother', 'Jeff'), ('Jeff', 'brother', 'Jacob')]}]
['brother', 'brother']