[Beverly] and [Dorothy] are sisters who have one brother named [Robert]. [Louis] is in the same grade as his sister [Marie], but his sister [Dorothy] is 2 years ahead of him.
('Marie', 'Beverly')
[Louis] is in the same grade as his sister [Marie], but his sister [Dorothy] is 2 years ahead of him. [Beverly] and [Dorothy] are sisters who have one brother named [Robert].
[{('Marie', 'sister', 'Beverly'): [('Marie', 'sister', 'Dorothy'), ('Dorothy', 'sister', 'Beverly')]}, {('Marie', 'sister', 'Dorothy'): [('Marie', 'brother', 'Louis'), ('Louis', 'sister', 'Dorothy')]}, {('Dorothy', 'sister', 'Beverly'): [('Dorothy', 'brother', 'Robert'), ('Robert', 'sister', 'Beverly')]}]
['brother', 'sister', 'brother', 'sister']