The story is so preposterous. You wonder how it even got greenlit.
I can only think that both Robert Wagner and Stefanie Powers laughed themselves silly when they read the script.
Vince contacts his estranged wife Connie. Forces her to take part in his daft plan, by telling her that he left her bracelet behind in a robbery.
The plan is to send their son to the Hart household and claim that he is Jonathan's son. All this because Connie once treated Jonathan Hart in hospital.
There would be chaos in the Hart household, later Vince would kidnap jr and demand a ransom.
So Jonathan Hart would pay a ransom for a random kid who is not even his!
I just kept thinking that if it was Donald Trump the tycoon. He would demand money from the kidnappers for having to feed and board the kid in the first place.