[Lorraine] does n't like having to babysit her younger brother, [Jacob]. [Jeff] was sad to learn that his sister [Lorraine] was not going to make it to dinner like they had planned.
('Jeff', 'Jacob')
[Jeff] was sad to learn that his sister [Lorraine] was not going to make it to dinner like they had planned. [Lorraine] does n't like having to babysit her younger brother, [Jacob].
[{('Jeff', 'brother', 'Jacob'): [('Jeff', 'sister', 'Lorraine'), ('Lorraine', 'brother', 'Jacob')]}]
['sister', 'brother']