[Chris] likes to play cards with his father [Wesley], his sister [Martha] and [Martha]'s husband [Irvin].
('Irvin', 'Wesley')
[Chris] likes to play cards with his father [Wesley], his sister [Martha] and [Martha]'s husband [Irvin].
[{('Irvin', 'father-in-law', 'Wesley'): [('Irvin', 'wife', 'Martha'), ('Martha', 'father', 'Wesley')]}, {('Martha', 'father', 'Wesley'): [('Martha', 'brother', 'Chris'), ('Chris', 'father', 'Wesley')]}]
['wife', 'brother', 'father']