[Irvin] was playing his sister [Tina]. Suddenly, [Tina]'s mother [Lena] called her to come upstairs right away. [Martha] went to dinner with her husband [Irvin].
('Martha', 'Lena')
[Martha] went to dinner with her husband [Irvin]. [Irvin] was playing his sister [Tina]. Suddenly, [Tina]'s mother [Lena] called her to come upstairs right away.
[{('Martha', 'mother-in-law', 'Lena'): [('Martha', 'husband', 'Irvin'), ('Irvin', 'mother', 'Lena')]}, {('Irvin', 'mother', 'Lena'): [('Irvin', 'sister', 'Tina'), ('Tina', 'mother', 'Lena')]}]
['husband', 'sister', 'mother']