[David] and her mother [Frances] went to pick up [David]'s son [Michael] from school because he had ball practice that day and needed a ride. [Michael]'s father [Hugh] is going to coach the team this year.
('Hugh', 'Frances')
[Michael]'s father [Hugh] is going to coach the team this year. [David] and her mother [Frances] went to pick up [David]'s son [Michael] from school because he had ball practice that day and needed a ride.
[{('Hugh', 'mother', 'Frances'): [('Hugh', 'son', 'Michael'), ('Michael', 'grandmother', 'Frances')]}, {('Michael', 'grandmother', 'Frances'): [('Michael', 'mother', 'David'), ('David', 'mother', 'Frances')]}]
['son', 'mother', 'mother']