[George] and his son, [Douglas], went to the store. [Lillian], [George]'s wife, wanted them to pick up stuff for dinner.
('Lillian', 'Douglas')
[George] and his son, [Douglas], went to the store. [Lillian], [George]'s wife, wanted them to pick up stuff for dinner.
[{('Lillian', 'son', 'Douglas'): [('Lillian', 'husband', 'George'), ('George', 'son', 'Douglas')]}]
['husband', 'son']