[Roy] asked his son, [Ernest], to go grocery shopping for him. [Ernest] was busy and sent his wife, [Constance], instead.
('Roy', 'Constance')
[Roy] asked his son, [Ernest], to go grocery shopping for him. [Ernest] was busy and sent his wife, [Constance], instead.
[{('Roy', 'daughter-in-law', 'Constance'): [('Roy', 'son', 'Ernest'), ('Ernest', 'wife', 'Constance')]}]