[Tracy]'s son, [Aaron], played with the cake dough while [Tracy]'s daughter, [Erika], mixed together ingredients. [Bobby]'s grandfather [Harold] made a pretty card for his brother, [Aaron].
('Harold', 'Erika')
[Bobby]'s grandfather [Harold] made a pretty card for his brother, [Aaron]. [Tracy]'s son, [Aaron], played with the cake dough while [Tracy]'s daughter, [Erika], mixed together ingredients.
[{('Harold', 'granddaughter', 'Erika'): [('Harold', 'grandson', 'Bobby'), ('Bobby', 'sister', 'Erika')]}, {('Bobby', 'sister', 'Erika'): [('Bobby', 'brother', 'Aaron'), ('Aaron', 'sister', 'Erika')]}, {('Aaron', 'sister', 'Erika'): [('Aaron', 'mother', 'Tracy'), ('Tracy', 'daughter', 'Erika')]}]
['grandson', 'brother', 'mother', 'daughter']