What Would've Happened With Mr Howell's Money?

What would have happened to Mr Howell’s money in real life? From the TV show GILLIGAN’S ISLAND.

OK Mr Howell is lost and presumed dead right. So after a number of years (I have heard seven but am not sure) he is declared dead and I will also assume that since he’s so rich, Howell has a will. Despite the fake kid Howell had in the reunion movie in the episode where the Howells adopt Gilligan both state they have no children.

So anyway Howell’s missing, declared dead and the assets are divded up according to his will or the law.

Now like 15 years later Howell is recused with the others. What happens to his now gone billions of dolllars. I guess the people who got them will have to give them back right? If so would they have to give just the amounts? Let’s say someone got a million and put it in the bank, I’m assuming they’d keep the interest earned but have to give back the million.

What if you spent all the money you got from Howell’s estate? Let’s say everything was done legally, it was yours? Would you have to pay Howell back? Or is Mr and Mrs Howell just screwed? Obviously it would depend on state law but any ideas?