[Dale] invited his daughter [Belva] to dinner. [Belva]'s husband [Travis] joined her.
('Travis', 'Dale')
[Dale] invited his daughter [Belva] to dinner. [Belva]'s husband [Travis] joined her.
[{('Travis', 'father-in-law', 'Dale'): [('Travis', 'wife', 'Belva'), ('Belva', 'father', 'Dale')]}]
['wife', 'father']