[Clarence] is a benevolent grandfather, and [Dennis] is his young grandson. [Dennis] asked his son, [Nicholas], to help paint his house.
('Nicholas', 'Clarence')
[Dennis] asked his son, [Nicholas], to help paint his house. [Clarence] is a benevolent grandfather, and [Dennis] is his young grandson.
[{('Nicholas', 'father', 'Clarence'): [('Nicholas', 'son', 'Dennis'), ('Dennis', 'grandfather', 'Clarence')]}]
['son', 'grandfather']