I still have a theory that the old boy was ticked off at his kids and ex-wife, that's why he married some bimbo in the last 20 minutes of his life and snatched their inheritance right out from under them. As for Anna, her lawyer in court probably argued that she's such a doped-up retard that her only hope in life is to be a rich heir. If she has to use a single brain cell ever again, she's not going to make it.
I think so too. I think his attitude was: "It's my money, I've spent my miserable life making it, and I'm going to spend it on making sure I have at least one person in my life who is totally focused on making my last years happy (otherwise I suspect a pre-nup would have had her out on the street with a token payment)