[Frances] taught her son [Hugh] how to mow the lawn once he was old enough. [Lena] asked [Frances], her mother, to teach her how to mow the lawn too. [Lena] and her daughter [Martha] were on vaction.
('Martha', 'Hugh')
[Lena] and her daughter [Martha] were on vaction. [Frances] taught her son [Hugh] how to mow the lawn once he was old enough. [Lena] asked [Frances], her mother, to teach her how to mow the lawn too.
[{('Martha', 'uncle', 'Hugh'): [('Martha', 'mother', 'Lena'), ('Lena', 'brother', 'Hugh')]}, {('Lena', 'brother', 'Hugh'): [('Lena', 'mother', 'Frances'), ('Frances', 'son', 'Hugh')]}]
['mother', 'mother', 'son']