[Jennifer]'s brother, [Dennis], was getting ready to start a new job. [Jennifer] was very happy for him. [Mary] is always around her brother [Dennis].
('Mary', 'Jennifer')
[Mary] is always around her brother [Dennis]. [Jennifer]'s brother, [Dennis], was getting ready to start a new job. [Jennifer] was very happy for him.
[{('Mary', 'sister', 'Jennifer'): [('Mary', 'brother', 'Dennis'), ('Dennis', 'sister', 'Jennifer')]}]
['brother', 'sister']