[Joshua]'s mother [Frances] and his sons [Thomas] and [Clarence] are all heading to the baseball game today.
('Clarence', 'Frances')
[Joshua]'s mother [Frances] and his sons [Thomas] and [Clarence] are all heading to the baseball game today.
[{('Clarence', 'grandmother', 'Frances'): [('Clarence', 'father', 'Joshua'), ('Joshua', 'mother', 'Frances')]}, {('Clarence', 'father', 'Joshua'): [('Clarence', 'brother', 'Thomas'), ('Thomas', 'father', 'Joshua')]}]
['brother', 'father', 'mother']