[Martha] and her Brother [Charles] were raised by their grandfather, [James]. [Charles]'s sister, [Mildred] is several years younger than them.
('Mildred', 'James')
[Martha] and her Brother [Charles] were raised by their grandfather, [James]. [Charles]'s sister, [Mildred] is several years younger than them.
[{('Mildred', 'grandfather', 'James'): [('Mildred', 'sister', 'Martha'), ('Martha', 'grandfather', 'James')]}, {('Mildred', 'sister', 'Martha'): [('Mildred', 'brother', 'Charles'), ('Charles', 'sister', 'Martha')]}]
['brother', 'sister', 'grandfather']