[David]'s brother [Wesley] and sister [Lynn] helped buy a gift for [Wesley]'s father [James].
('Lynn', 'James')
[David]'s brother [Wesley] and sister [Lynn] helped buy a gift for [Wesley]'s father [James].
[{('Lynn', 'father', 'James'): [('Lynn', 'brother', 'Wesley'), ('Wesley', 'father', 'James')]}, {('Lynn', 'brother', 'Wesley'): [('Lynn', 'sister', 'David'), ('David', 'brother', 'Wesley')]}]
['sister', 'brother', 'father']