[David] was honored to take her son [Bobby] to the mother son dance at her son's school last Friday. [Frances] could n't pick up her son [Joshua] at the airport. She decided to ask her daughter [David] to do it.
('Bobby', 'Joshua')
[David] was honored to take her son [Bobby] to the mother son dance at her son's school last Friday. [Frances] could n't pick up her son [Joshua] at the airport. She decided to ask her daughter [David] to do it.
[{('Bobby', 'uncle', 'Joshua'): [('Bobby', 'mother', 'David'), ('David', 'brother', 'Joshua')]}, {('David', 'brother', 'Joshua'): [('David', 'mother', 'Frances'), ('Frances', 'son', 'Joshua')]}]
['mother', 'mother', 'son']