[Lena] took her younger sister [David] to the carnival last weekend. [Bobby] is son of [David]. [Lynn] and her sister [Lena] were getting together this weekend so that they could go hiking together they had n't spent time together alone in a while.
('Bobby', 'Lynn')
[Bobby] is son of [David]. [Lena] took her younger sister [David] to the carnival last weekend. [Lynn] and her sister [Lena] were getting together this weekend so that they could go hiking together they had n't spent time together alone in a while.
[{('Bobby', 'aunt', 'Lynn'): [('Bobby', 'mother', 'David'), ('David', 'sister', 'Lynn')]}, {('David', 'sister', 'Lynn'): [('David', 'sister', 'Lena'), ('Lena', 'sister', 'Lynn')]}]
['mother', 'sister', 'sister']