[David] took her son [Bobby] to the football game. [Frances] was busy planning her grandson's, [Bobby], birthday party. [Marie] went shopping at the mall with her mother [David]
('Marie', 'Frances')
[Marie] went shopping at the mall with her mother [David] [David] took her son [Bobby] to the football game. [Frances] was busy planning her grandson's, [Bobby], birthday party.
[{('Marie', 'grandmother', 'Frances'): [('Marie', 'brother', 'Bobby'), ('Bobby', 'grandmother', 'Frances')]}, {('Marie', 'brother', 'Bobby'): [('Marie', 'mother', 'David'), ('David', 'son', 'Bobby')]}]
['mother', 'son', 'grandmother']