[Jacob]'s mother, [Nancy], made decorations for her father's, [Clarence], birthday party.
('Jacob', 'Clarence')
[Jacob]'s mother, [Nancy], made decorations for her father's, [Clarence], birthday party.
[{('Jacob', 'grandfather', 'Clarence'): [('Jacob', 'mother', 'Nancy'), ('Nancy', 'father', 'Clarence')]}]
['mother', 'father']