[Scott] saw his sons [John] and [Rich] at the family reunion, as well as [Rich]'s son [Dale].
('John', 'Dale')
[Scott] saw his sons [John] and [Rich] at the family reunion, as well as [Rich]'s son [Dale].
[{('John', 'nephew', 'Dale'): [('John', 'brother', 'Rich'), ('Rich', 'son', 'Dale')]}, {('John', 'brother', 'Rich'): [('John', 'father', 'Scott'), ('Scott', 'son', 'Rich')]}]