[Pamela] and her mother [Lena] were on their way to meet up with her brother [Chris]. On the way they picked up [Pamela]'s sister [Charles] to join them.
('Chris', 'Lena')
[Pamela] and her mother [Lena] were on their way to meet up with her brother [Chris]. On the way they picked up [Pamela]'s sister [Charles] to join them.
[{('Chris', 'mother', 'Lena'): [('Chris', 'brother', 'Charles'), ('Charles', 'mother', 'Lena')]}, {('Charles', 'mother', 'Lena'): [('Charles', 'sister', 'Pamela'), ('Pamela', 'mother', 'Lena')]}]
['brother', 'sister', 'mother']