[Douglas] and [April] were celebrating their third wedding anniversary, so [April]'s mother [Lillian] watched their pets while they were gone.
('Douglas', 'Lillian')
[Douglas] and [April] were celebrating their third wedding anniversary, so [April]'s mother [Lillian] watched their pets while they were gone.
[{('Douglas', 'mother-in-law', 'Lillian'): [('Douglas', 'wife', 'April'), ('April', 'mother', 'Lillian')]}]
['wife', 'mother']