[Douglas] decided to take his wife [April] to a romantic dinner in a French restaurant [April] took her mother, [Lillian], out for lunch.
('Douglas', 'Lillian')
[Douglas] decided to take his wife [April] to a romantic dinner in a French restaurant [April] took her mother, [Lillian], out for lunch.
[{('Douglas', 'mother-in-law', 'Lillian'): [('Douglas', 'wife', 'April'), ('April', 'mother', 'Lillian')]}]
['wife', 'mother']