[Mildred] went with her husband [Chris] to get a nice dinner for their anniversary. [Mildred] was playing in the sandbox with her brother [Irvin]. [Irvin] is son of [Lena].
('Chris', 'Lena')
[Mildred] went with her husband [Chris] to get a nice dinner for their anniversary. [Mildred] was playing in the sandbox with her brother [Irvin]. [Irvin] is son of [Lena].
[{('Chris', 'mother-in-law', 'Lena'): [('Chris', 'wife', 'Mildred'), ('Mildred', 'mother', 'Lena')]}, {('Mildred', 'mother', 'Lena'): [('Mildred', 'brother', 'Irvin'), ('Irvin', 'mother', 'Lena')]}]
['wife', 'brother', 'mother']