[Frances] took her daughter, [David], out to High Tea yesterday afternoon. [David] drove her son [Michael] to his soccer game. [Frances] and her daughter [Lena] were on vaction.
('Lena', 'Michael')
[Frances] and her daughter [Lena] were on vaction. [Frances] took her daughter, [David], out to High Tea yesterday afternoon. [David] drove her son [Michael] to his soccer game.
[{('Lena', 'nephew', 'Michael'): [('Lena', 'sister', 'David'), ('David', 'son', 'Michael')]}, {('Lena', 'sister', 'David'): [('Lena', 'mother', 'Frances'), ('Frances', 'daughter', 'David')]}]
['mother', 'daughter', 'son']