[Robert] took his son [John] to soccer practice. [Louis] decided to take his son, [Samuel], on a ski vacation. [Louis] invited his nephew [John] to go hunting with him on Saturday. [John] said he would love to go with him. [Samuel] asked his aunt [Dorothy] what college he should attend.
('Robert', 'Dorothy')
[Robert] took his son [John] to soccer practice. [Louis] invited his nephew [John] to go hunting with him on Saturday. [John] said he would love to go with him. [Louis] decided to take his son, [Samuel], on a ski vacation. [Samuel] asked his aunt [Dorothy] what college he should attend.
[{('Robert', 'sister', 'Dorothy'): [('Robert', 'brother', 'Louis'), ('Louis', 'sister', 'Dorothy')]}, {('Louis', 'sister', 'Dorothy'): [('Louis', 'son', 'Samuel'), ('Samuel', 'aunt', 'Dorothy')]}, {('Robert', 'brother', 'Louis'): [('Robert', 'son', 'John'), ('John', 'uncle', 'Louis')]}]
['son', 'uncle', 'son', 'aunt']