[James] is a proud grandfather of [Charles]. [Charles] has a great relationship with his mother [Lena]. [Lena] and her sister [David] braided each other's hair before school.
('David', 'James')
[Lena] and her sister [David] braided each other's hair before school. [James] is a proud grandfather of [Charles]. [Charles] has a great relationship with his mother [Lena].
[{('David', 'father', 'James'): [('David', 'sister', 'Lena'), ('Lena', 'father', 'James')]}, {('Lena', 'father', 'James'): [('Lena', 'son', 'Charles'), ('Charles', 'grandfather', 'James')]}]
['sister', 'son', 'grandfather']