[Linda] and her sister [Lorraine] were getting together this weekend so that they could go hiking together they had n't spent time together alone in a while. [Jacob] liked to play games with his sister, [Lorraine].
('Jacob', 'Linda')
[Jacob] liked to play games with his sister, [Lorraine]. [Linda] and her sister [Lorraine] were getting together this weekend so that they could go hiking together they had n't spent time together alone in a while.
[{('Jacob', 'sister', 'Linda'): [('Jacob', 'sister', 'Lorraine'), ('Lorraine', 'sister', 'Linda')]}]
['sister', 'sister']