[Lillian] and [Nancy], both sisters, are feeling frazzled after [Nancy] gave birth to [Jeff], a son.
('Lillian', 'Jeff')
[Lillian] and [Nancy], both sisters, are feeling frazzled after [Nancy] gave birth to [Jeff], a son.
[{('Lillian', 'nephew', 'Jeff'): [('Lillian', 'sister', 'Nancy'), ('Nancy', 'son', 'Jeff')]}]
['sister', 'son']