[James] is raising his daughter, [Lena] all by himself. [David] took her father [James] and her daughter [Marie] to the park
('Marie', 'Lena')
[David] took her father [James] and her daughter [Marie] to the park [James] is raising his daughter, [Lena] all by himself.
[{('Marie', 'aunt', 'Lena'): [('Marie', 'mother', 'David'), ('David', 'sister', 'Lena')]}, {('David', 'sister', 'Lena'): [('David', 'father', 'James'), ('James', 'daughter', 'Lena')]}]
['mother', 'father', 'daughter']