[Samuel] asked his father, [Louis] to help him build a birdhouse. [Louis] love his brother [Pedro]. They are always playing together. [Pedro] asked his sister [Tracy] to help him with his math homework. [Tracy] was n't sure what to do, so she asked her sister [Dorothy] for some help.
('Dorothy', 'Samuel')
[Pedro] asked his sister [Tracy] to help him with his math homework. [Tracy] was n't sure what to do, so she asked her sister [Dorothy] for some help. [Louis] love his brother [Pedro]. They are always playing together. [Samuel] asked his father, [Louis] to help him build a birdhouse.
[{('Dorothy', 'nephew', 'Samuel'): [('Dorothy', 'brother', 'Louis'), ('Louis', 'son', 'Samuel')]}, {('Dorothy', 'brother', 'Louis'): [('Dorothy', 'sister', 'Tracy'), ('Tracy', 'brother', 'Louis')]}, {('Tracy', 'brother', 'Louis'): [('Tracy', 'brother', 'Pedro'), ('Pedro', 'brother', 'Louis')]}]
['sister', 'brother', 'brother', 'son']