[George] was having a cookout one day, and invited his sister [Theresa]. [Theresa]'s brother [Wayne] drove them to the cookout.
('Wayne', 'George')
[George] was having a cookout one day, and invited his sister [Theresa]. [Theresa]'s brother [Wayne] drove them to the cookout.
[{('Wayne', 'brother', 'George'): [('Wayne', 'sister', 'Theresa'), ('Theresa', 'brother', 'George')]}]
['sister', 'brother']