[David] took her sister [Lena] out for dinner to celebrate her birthday. [David] baked a cake for her son [Johnson]. [James] spends every weekend teaching his grandson, [Johnson] how to do different construction projects.
('Lena', 'James')
[David] took her sister [Lena] out for dinner to celebrate her birthday. [David] baked a cake for her son [Johnson]. [James] spends every weekend teaching his grandson, [Johnson] how to do different construction projects.
[{('Lena', 'father', 'James'): [('Lena', 'sister', 'David'), ('David', 'father', 'James')]}, {('David', 'father', 'James'): [('David', 'son', 'Johnson'), ('Johnson', 'grandfather', 'James')]}]
['sister', 'son', 'grandfather']