[Robert]'s son [Allan] entered rehab for the ninth time at the age of thirty. [Beverly] and [Marie] took [Beverly]'s daughter [Nettie] to their family's land in Germany for a summer vacation. [Marie] picked up her son [Allan] from the mall
('Robert', 'Nettie')
[Robert]'s son [Allan] entered rehab for the ninth time at the age of thirty. [Marie] picked up her son [Allan] from the mall [Beverly] and [Marie] took [Beverly]'s daughter [Nettie] to their family's land in Germany for a summer vacation.
[{('Robert', 'niece', 'Nettie'): [('Robert', 'sister', 'Beverly'), ('Beverly', 'daughter', 'Nettie')]}, {('Robert', 'sister', 'Beverly'): [('Robert', 'son', 'Allan'), ('Allan', 'aunt', 'Beverly')]}, {('Allan', 'aunt', 'Beverly'): [('Allan', 'mother', 'Marie'), ('Marie', 'sister', 'Beverly')]}]
['son', 'mother', 'sister', 'daughter']