Legal QuestionAbout The Ending (SPOILERS)

This question bugs me from time to time about Family Plot:

As the movie goes along, we learn a number of things about jeweler Arthur Adamson(the elegant and oily William Devane):

His real name is Edward Shoebridge.
But his criminal pal Joe Maloney knew him as Eddie Shoebridge.
Eddie Shoebridge and Joe Maloney set fire to the home of Eddie's foster parents, killing them.
Arthur Adamson/Eddie Shoebridge is now making extra money(milliions of it) kidnapping millionaires and VIPS for ransom.
Arthur Adamson/Eddie Shoebridge...is the heir to a multi-million dollar fortune(but he has to wait for a 78 year old woman to die before he can claim it.)

So the legal question:

At the end of Family Plot, "heroes" Bruce Dern(Lumley) and Barbara Harris(Madame Blanche) trap "villains" William Devane(Adamson) and Karen Black(Fran) in the very locked room in which they keep kidnap victims. Then Dern calls the police.

Arthur Adamson is clearly going to prison for a long time(his girlfriend Fran is, too.)

Is Adamson still entitled to the inheritance?

I suppose he would have been -- IF Julia Rainbird had died.

But she hadn't even found him to make a new will yet. So the legal question never came up.

In the alternative, let's say that Julia made a will "to the rightful Rainbird heir," signed it, and died.

If Adamson/Shoebridge could be found to be the rightful Rainbird heir, with Julia dead..I daresay he WOULD be entitled to collect the inheritance. But only after relase from prison.

And I suppose he would need to pay back the ransom money out of his inheritance.

But its all moot. He was captured and unmasked as a baddie before Juiia could change her will.

UNLESS:

Julia changed the will anyway: "So what if he's a bad boy, I want him to have the money."

Questions, questions.

PS. I trust that Julia Rainbird paid Madame Blanche and Lumley the $10,000 as agreed.