Conversation so far:
When was J. Paul Getty's grandson kidnapped?
July 10th 1973
Who kidnapped J. Paul Getty's grandson?
'Ndrangheta
How old was J. Paul Getty's grandson when he was kidnapped?
16
Where did they take J. Paul Getty's grandson to?
What was the ransom amount for J. Paul Getty's grandson
$17 million
Did J. Paul Getty's grandson live with him?
Are there any other interesting aspects about J. Paul Getty?
However, the family suspected a ploy by the rebellious teenager to extract money from his miserly grandfather. John Paul Getty Jr. asked his father for the money, but was refused.

Question: Was this suspicion proven to be true?
Self-contained rewrite: Was this suspician of John Paul Getty Jr. proven to be true?