[George] and his brother [Dale] watch [George]'s daughter [Ann] in her school play.
('Dale', 'Ann')
[George] and his brother [Dale] watch [George]'s daughter [Ann] in her school play.
[{('Dale', 'niece', 'Ann'): [('Dale', 'brother', 'George'), ('George', 'daughter', 'Ann')]}]
['brother', 'daughter']