[Robert] is so proud of his son. [Allan] is the son's name. [Marie] is so happy for her son. Her son [Allan] just joined the Army. [Louis] is helping his son study. His name is [Samuel]. [Louis] took his sister [Marie] out to dinner for her birthday.
('Robert', 'Samuel')
[Robert] is so proud of his son. [Allan] is the son's name. [Marie] is so happy for her son. Her son [Allan] just joined the Army. [Louis] took his sister [Marie] out to dinner for her birthday. [Louis] is helping his son study. His name is [Samuel].
[{('Robert', 'nephew', 'Samuel'): [('Robert', 'brother', 'Louis'), ('Louis', 'son', 'Samuel')]}, {('Robert', 'brother', 'Louis'): [('Robert', 'son', 'Allan'), ('Allan', 'uncle', 'Louis')]}, {('Allan', 'uncle', 'Louis'): [('Allan', 'mother', 'Marie'), ('Marie', 'brother', 'Louis')]}]
['son', 'mother', 'brother', 'son']