[Jerry] and his sister [Ann] stood in line at the fair. [Lillian] took her son [Jerry] shopping for new school clothes. They had a good time.
('Ann', 'Lillian')
[Jerry] and his sister [Ann] stood in line at the fair. [Lillian] took her son [Jerry] shopping for new school clothes. They had a good time.
[{('Ann', 'mother', 'Lillian'): [('Ann', 'brother', 'Jerry'), ('Jerry', 'mother', 'Lillian')]}]
['brother', 'mother']