[Brandon]'s brother [Johnson] and mother [David] met him early in the morning before his college graduation. [Lena] took her sister [David] out for dinner to celebrate her birthday.
('Johnson', 'Lena')
[Brandon]'s brother [Johnson] and mother [David] met him early in the morning before his college graduation. [Lena] took her sister [David] out for dinner to celebrate her birthday.
[{('Johnson', 'aunt', 'Lena'): [('Johnson', 'mother', 'David'), ('David', 'sister', 'Lena')]}, {('Johnson', 'mother', 'David'): [('Johnson', 'brother', 'Brandon'), ('Brandon', 'mother', 'David')]}]
['brother', 'mother', 'sister']