[Charles] was outside playing with his father [Wesley] when [David], who is [Wesley]'s sister, brought them a cake that was made by her brother [Joshua].
('Joshua', 'Charles')
[Charles] was outside playing with his father [Wesley] when [David], who is [Wesley]'s sister, brought them a cake that was made by her brother [Joshua].
[{('Joshua', 'nephew', 'Charles'): [('Joshua', 'brother', 'Wesley'), ('Wesley', 'son', 'Charles')]}, {('Joshua', 'brother', 'Wesley'): [('Joshua', 'sister', 'David'), ('David', 'brother', 'Wesley')]}]
['sister', 'brother', 'son']