[Timmy] was playing checkers with his grandmother [Mary], when he received a call from his sister [Geraldine].
('Mary', 'Geraldine')
[Timmy] was playing checkers with his grandmother [Mary], when he received a call from his sister [Geraldine].
[{('Mary', 'granddaughter', 'Geraldine'): [('Mary', 'grandson', 'Timmy'), ('Timmy', 'sister', 'Geraldine')]}]