[Clarence]'s grandson [Michael] always bought the worst presents for people. This made things awkward for [Michael]'s sister [Mary].
('Clarence', 'Mary')
[Clarence]'s grandson [Michael] always bought the worst presents for people. This made things awkward for [Michael]'s sister [Mary].
[{('Clarence', 'granddaughter', 'Mary'): [('Clarence', 'grandson', 'Michael'), ('Michael', 'sister', 'Mary')]}]
['grandson', 'sister']