[Douglas] and his brother [Jerry] are looking for a good gift for [Jerry]'s mother [Lillian].
('Lillian', 'Douglas')
[Douglas] and his brother [Jerry] are looking for a good gift for [Jerry]'s mother [Lillian].
[{('Lillian', 'son', 'Douglas'): [('Lillian', 'son', 'Jerry'), ('Jerry', 'brother', 'Douglas')]}]
['son', 'brother']