[Lynn] and her brother [Francisco] decided to organize a family vacation. [Francisco] called his sister [Lena] to invite her, while [Lynn] called her sister [David].
('David', 'Lena')
[Lynn] and her brother [Francisco] decided to organize a family vacation. [Francisco] called his sister [Lena] to invite her, while [Lynn] called her sister [David].
[{('David', 'sister', 'Lena'): [('David', 'sister', 'Lynn'), ('Lynn', 'sister', 'Lena')]}, {('Lynn', 'sister', 'Lena'): [('Lynn', 'brother', 'Francisco'), ('Francisco', 'sister', 'Lena')]}]
['sister', 'brother', 'sister']