[Carl] was sad to learn that his sister [Alberta] was not going to make it to dinner like they had planned. [Alberta] called her grandfather [Roy] on the phone, and asked if he would be visiting her soon. [Roy] told her he'd be over tomorrow.
('Carl', 'Roy')
[Carl] was sad to learn that his sister [Alberta] was not going to make it to dinner like they had planned. [Alberta] called her grandfather [Roy] on the phone, and asked if he would be visiting her soon. [Roy] told her he'd be over tomorrow.
[{('Carl', 'grandfather', 'Roy'): [('Carl', 'sister', 'Alberta'), ('Alberta', 'grandfather', 'Roy')]}]