[Richard] is [Wayne]'s brother. [Natasha] is [Richard]'s sister. [Wayne] is a brother of [Leonard]. bat
('Leonard', 'Natasha')
[Richard] is [Wayne]'s brother. [Natasha] is [Richard]'s sister. [Wayne] is a brother of [Leonard]. bat
[{('Leonard', 'sister', 'Natasha'): [('Leonard', 'brother', 'Wayne'), ('Wayne', 'sister', 'Natasha')]}, {('Wayne', 'sister', 'Natasha'): [('Wayne', 'brother', 'Richard'), ('Richard', 'sister', 'Natasha')]}]
['brother', 'brother', 'sister']