[Lena] has a son named [Charles]. [Chris] has been with [Mildred] for 10 years. [Mildred] has been married for two years. [Charles] and his brother [Chris] went out for lunch. [Charles] had a burger, and [Chris] had a chicken sandwich.
('Lena', 'Mildred')
[Lena] has a son named [Charles]. [Charles] and his brother [Chris] went out for lunch. [Charles] had a burger, and [Chris] had a chicken sandwich. [Chris] has been with [Mildred] for 10 years. [Mildred] has been married for two years.
[{('Lena', 'daughter-in-law', 'Mildred'): [('Lena', 'son', 'Chris'), ('Chris', 'wife', 'Mildred')]}, {('Lena', 'son', 'Chris'): [('Lena', 'son', 'Charles'), ('Charles', 'brother', 'Chris')]}]
['son', 'brother', 'wife']