[Irvin] went to the park with his father, [Wesley]. [Wesley]'s mother [Frances] was present at the thanksgiving service. [Lena] liked to play hide and seek with her son [Irvin].
('Lena', 'Frances')
[Lena] liked to play hide and seek with her son [Irvin]. [Irvin] went to the park with his father, [Wesley]. [Wesley]'s mother [Frances] was present at the thanksgiving service.
[{('Lena', 'mother', 'Frances'): [('Lena', 'son', 'Irvin'), ('Irvin', 'grandmother', 'Frances')]}, {('Irvin', 'grandmother', 'Frances'): [('Irvin', 'father', 'Wesley'), ('Wesley', 'mother', 'Frances')]}]
['son', 'father', 'mother']