[Michael] and his sister [Mary] were painting her house. [Michael]'s grandfather, [Clarence], came over to help.
('Clarence', 'Mary')
[Michael] and his sister [Mary] were painting her house. [Michael]'s grandfather, [Clarence], came over to help.
[{('Clarence', 'granddaughter', 'Mary'): [('Clarence', 'grandson', 'Michael'), ('Michael', 'sister', 'Mary')]}]
['grandson', 'sister']