[Rich] and his wife [Michelle] went on vacation with their son [Harry] and his wife [Cheryl].
('Rich', 'Cheryl')
[Rich] and his wife [Michelle] went on vacation with their son [Harry] and his wife [Cheryl].
[{('Rich', 'daughter-in-law', 'Cheryl'): [('Rich', 'son', 'Harry'), ('Harry', 'wife', 'Cheryl')]}, {('Rich', 'son', 'Harry'): [('Rich', 'wife', 'Michelle'), ('Michelle', 'son', 'Harry')]}]