[Pamela] borrowed some money from her brother [Chris]. [Pamela] needed to go to the store. [Pamela] asked her sister [Martha] for a ride. [Lena] is so happy for her son. Her son [Chris] just joined the Army.
('Martha', 'Lena')
[Pamela] needed to go to the store. [Pamela] asked her sister [Martha] for a ride. [Pamela] borrowed some money from her brother [Chris]. [Lena] is so happy for her son. Her son [Chris] just joined the Army.
[{('Martha', 'mother', 'Lena'): [('Martha', 'sister', 'Pamela'), ('Pamela', 'mother', 'Lena')]}, {('Pamela', 'mother', 'Lena'): [('Pamela', 'brother', 'Chris'), ('Chris', 'mother', 'Lena')]}]
['sister', 'brother', 'mother']