[Don] likes it when his mother, [Lynn], plays the flute. [Lynn] learned this skill from her mother, [Frances]. [Joshua] is an engineer who loves to take his son [Don] to the science museum to help him learn about the world
('Joshua', 'Frances')
[Joshua] is an engineer who loves to take his son [Don] to the science museum to help him learn about the world [Don] likes it when his mother, [Lynn], plays the flute. [Lynn] learned this skill from her mother, [Frances].
[{('Joshua', 'mother', 'Frances'): [('Joshua', 'son', 'Don'), ('Don', 'grandmother', 'Frances')]}, {('Don', 'grandmother', 'Frances'): [('Don', 'mother', 'Lynn'), ('Lynn', 'mother', 'Frances')]}]
['son', 'mother', 'mother']