[Pamela] went with her brother [Charles] to the mall to buy some new candles. [Chris]'s mother [Lena] made a cake for his birthday and her other son [Charles] ate a piece of it.
('Chris', 'Pamela')
[Chris]'s mother [Lena] made a cake for his birthday and her other son [Charles] ate a piece of it. [Pamela] went with her brother [Charles] to the mall to buy some new candles.
[{('Chris', 'sister', 'Pamela'): [('Chris', 'mother', 'Lena'), ('Lena', 'daughter', 'Pamela')]}, {('Lena', 'daughter', 'Pamela'): [('Lena', 'son', 'Charles'), ('Charles', 'sister', 'Pamela')]}]
['mother', 'son', 'sister']