[Nicholas] and his sister [Nancy] stood in line at the fair. [Robert] sent flowers to his mother [Nancy] for Mother's Day.
('Robert', 'Nicholas')
[Robert] sent flowers to his mother [Nancy] for Mother's Day. [Nicholas] and his sister [Nancy] stood in line at the fair.
[{('Robert', 'uncle', 'Nicholas'): [('Robert', 'mother', 'Nancy'), ('Nancy', 'brother', 'Nicholas')]}]
['mother', 'brother']