[John] took his mother [Marie] and his sister [Elsie] out to lunch. [Robert] took his daughter [Elsie] out for ice cream. His other daughter, [Michelle], was still in school and could not go.
('Marie', 'Michelle')
[John] took his mother [Marie] and his sister [Elsie] out to lunch. [Robert] took his daughter [Elsie] out for ice cream. His other daughter, [Michelle], was still in school and could not go.
[{('Marie', 'daughter', 'Michelle'): [('Marie', 'daughter', 'Elsie'), ('Elsie', 'sister', 'Michelle')]}, {('Elsie', 'sister', 'Michelle'): [('Elsie', 'father', 'Robert'), ('Robert', 'daughter', 'Michelle')]}, {('Marie', 'daughter', 'Elsie'): [('Marie', 'son', 'John'), ('John', 'sister', 'Elsie')]}]
['son', 'sister', 'father', 'daughter']