[Erika] went shopping at the mall with her mother [Tracy] [Bobby] and his sister [Bettie] were twins. Still, they did n't look very much alike. [Harold]'s granddaughter [Bettie] is coming over to visit him this afternoon. [Tracy] was so excited to learn that her son [Bobby] got accepted into college.
('Erika', 'Harold')
[Erika] went shopping at the mall with her mother [Tracy] [Tracy] was so excited to learn that her son [Bobby] got accepted into college. [Bobby] and his sister [Bettie] were twins. Still, they did n't look very much alike. [Harold]'s granddaughter [Bettie] is coming over to visit him this afternoon.
[{('Erika', 'grandfather', 'Harold'): [('Erika', 'brother', 'Bobby'), ('Bobby', 'grandfather', 'Harold')]}, {('Bobby', 'grandfather', 'Harold'): [('Bobby', 'sister', 'Bettie'), ('Bettie', 'grandfather', 'Harold')]}, {('Erika', 'brother', 'Bobby'): [('Erika', 'mother', 'Tracy'), ('Tracy', 'son', 'Bobby')]}]
['mother', 'son', 'sister', 'grandfather']