[Amy]'s father, [Clarence], took her to the bowling alley. [Amy]'s daughter, [Mary], joined them because bowling was her favorite hobby.
('Mary', 'Clarence')
[Amy]'s father, [Clarence], took her to the bowling alley. [Amy]'s daughter, [Mary], joined them because bowling was her favorite hobby.
[{('Mary', 'grandfather', 'Clarence'): [('Mary', 'mother', 'Amy'), ('Amy', 'father', 'Clarence')]}]
['mother', 'father']