[Jennifer] asks her sister [Mary] for help looking for a gift. [Jennifer] wants to buy something for her brother [Glen]'s birthday.
('Mary', 'Glen')
[Jennifer] asks her sister [Mary] for help looking for a gift. [Jennifer] wants to buy something for her brother [Glen]'s birthday.
[{('Mary', 'brother', 'Glen'): [('Mary', 'sister', 'Jennifer'), ('Jennifer', 'brother', 'Glen')]}]
['sister', 'brother']