[John] and his mother, [Lillian] and his wife, [Andrea] all have the same birthday.
('Andrea', 'Lillian')
[John] and his mother, [Lillian] and his wife, [Andrea] all have the same birthday.
[{('Andrea', 'mother-in-law', 'Lillian'): [('Andrea', 'husband', 'John'), ('John', 'mother', 'Lillian')]}]
['husband', 'mother']