[Amy] and her sister [Lillian] were getting together this weekend so that they could go hiking together they had n't spent time together alone in a while. [Amy] took her son [Dennis] to the mall to shop for school clothes.
('Lillian', 'Dennis')
[Amy] and her sister [Lillian] were getting together this weekend so that they could go hiking together they had n't spent time together alone in a while. [Amy] took her son [Dennis] to the mall to shop for school clothes.
[{('Lillian', 'nephew', 'Dennis'): [('Lillian', 'sister', 'Amy'), ('Amy', 'son', 'Dennis')]}]
['sister', 'son']