[Pamela] called her father [Wesley] on the phone, but he was on the other line with his son [Chris]. He told [Pamela] he'd call her back in a few minutes. [Pamela] and her sister [Martha] braided each other's hair before school.
('Martha', 'Chris')
[Pamela] and her sister [Martha] braided each other's hair before school. [Pamela] called her father [Wesley] on the phone, but he was on the other line with his son [Chris]. He told [Pamela] he'd call her back in a few minutes.
[{('Martha', 'brother', 'Chris'): [('Martha', 'father', 'Wesley'), ('Wesley', 'son', 'Chris')]}, {('Martha', 'father', 'Wesley'): [('Martha', 'sister', 'Pamela'), ('Pamela', 'father', 'Wesley')]}]
['sister', 'father', 'son']