[William] and his wife [Marjorie] decided to visit [Marjorie]'s mother [Stephanie] on Sunday.
('William', 'Stephanie')
[William] and his wife [Marjorie] decided to visit [Marjorie]'s mother [Stephanie] on Sunday.
[{('William', 'mother-in-law', 'Stephanie'): [('William', 'wife', 'Marjorie'), ('Marjorie', 'mother', 'Stephanie')]}]