[Lena] made a dress for her daughter [Tina]. [Tina]'s sister [Martha] was so jealous. [Martha] called [Mildred], her sister, to see if she wanted to go out to eat.
('Mildred', 'Lena')
[Martha] called [Mildred], her sister, to see if she wanted to go out to eat. [Lena] made a dress for her daughter [Tina]. [Tina]'s sister [Martha] was so jealous.
[{('Mildred', 'mother', 'Lena'): [('Mildred', 'sister', 'Martha'), ('Martha', 'mother', 'Lena')]}, {('Martha', 'mother', 'Lena'): [('Martha', 'sister', 'Tina'), ('Tina', 'mother', 'Lena')]}]
['sister', 'sister', 'mother']