[Bobby]'s mother [David] was present at the thanksgiving service. [Bobby] asked his son, [Hugh], to help paint his house. [David]'s mom, [Frances], has recently taken art classes.
('Hugh', 'Frances')
[Bobby] asked his son, [Hugh], to help paint his house. [Bobby]'s mother [David] was present at the thanksgiving service. [David]'s mom, [Frances], has recently taken art classes.
[{('Hugh', 'mother', 'Frances'): [('Hugh', 'son', 'Bobby'), ('Bobby', 'grandmother', 'Frances')]}, {('Bobby', 'grandmother', 'Frances'): [('Bobby', 'mother', 'David'), ('David', 'mother', 'Frances')]}]
['son', 'mother', 'mother']