[George] and his daughter, [Janet] go to concerts every week. [George] and his sister [Nancy] stood in line at the fair.
('Nancy', 'Janet')
[George] and his sister [Nancy] stood in line at the fair. [George] and his daughter, [Janet] go to concerts every week.
[{('Nancy', 'niece', 'Janet'): [('Nancy', 'brother', 'George'), ('George', 'daughter', 'Janet')]}]
['brother', 'daughter']