[Martha]'s son, [Franklin], went away for the weekend. He was going to spend it at his grandmother [Mary]'s house.
('Martha', 'Mary')
[Martha]'s son, [Franklin], went away for the weekend. He was going to spend it at his grandmother [Mary]'s house.
[{('Martha', 'mother', 'Mary'): [('Martha', 'son', 'Franklin'), ('Franklin', 'grandmother', 'Mary')]}]