[Pamela] was playing in the sandbox with her brother [Chris]. [Chris] likes it when his mother, [Lena], plays the flute. [Lena] learned this skill from her mother, [Frances].
('Pamela', 'Frances')
[Pamela] was playing in the sandbox with her brother [Chris]. [Chris] likes it when his mother, [Lena], plays the flute. [Lena] learned this skill from her mother, [Frances].
[{('Pamela', 'grandmother', 'Frances'): [('Pamela', 'mother', 'Lena'), ('Lena', 'mother', 'Frances')]}, {('Pamela', 'mother', 'Lena'): [('Pamela', 'brother', 'Chris'), ('Chris', 'mother', 'Lena')]}]
['brother', 'mother', 'mother']