[Samuel] invited his father, [Louis], and [Louis]'s father, [Harold], to his college graduation. [Harold] wondered why his daughter, [Marie], had n't been invited. [Samuel]'s sister [Karen] asked him for some help planting her garden.
('Karen', 'Marie')
[Samuel]'s sister [Karen] asked him for some help planting her garden. [Samuel] invited his father, [Louis], and [Louis]'s father, [Harold], to his college graduation. [Harold] wondered why his daughter, [Marie], had n't been invited.
[{('Karen', 'aunt', 'Marie'): [('Karen', 'father', 'Louis'), ('Louis', 'sister', 'Marie')]}, {('Louis', 'sister', 'Marie'): [('Louis', 'father', 'Harold'), ('Harold', 'daughter', 'Marie')]}, {('Karen', 'father', 'Louis'): [('Karen', 'brother', 'Samuel'), ('Samuel', 'father', 'Louis')]}]
['brother', 'father', 'father', 'daughter']