[Irvin]'s brother [Charles] and father [Wesley] had Thanksgiving dinner with [Wesley]'s mother, [Frances].
('Charles', 'Frances')
[Irvin]'s brother [Charles] and father [Wesley] had Thanksgiving dinner with [Wesley]'s mother, [Frances].
[{('Charles', 'grandmother', 'Frances'): [('Charles', 'father', 'Wesley'), ('Wesley', 'mother', 'Frances')]}, {('Charles', 'father', 'Wesley'): [('Charles', 'brother', 'Irvin'), ('Irvin', 'father', 'Wesley')]}]
['brother', 'father', 'mother']