[Lillian] liked to play hide and seek with her son [Douglas]. [Wayne] made dinner reservations for his sister [Lillian].
('Wayne', 'Douglas')
[Wayne] made dinner reservations for his sister [Lillian]. [Lillian] liked to play hide and seek with her son [Douglas].
[{('Wayne', 'nephew', 'Douglas'): [('Wayne', 'sister', 'Lillian'), ('Lillian', 'son', 'Douglas')]}]
['sister', 'son']