Awesome Machine,
I never heard a story like yours (maybe on "Twilight Zone") and probably never will (at least I'd like to think so).
Take care in becoming obsessed with your power over them. I'm not saying that it is not justified, but your ENJOYMENT of it could turn you into a madman.
The best thing would be to modify your will so that it completely excludes any involvement of them in your's or your children's lives FOREVER (fully documenting the situation with chemical assessment of the cookies so that future court battles would not overturn your modified will, a "NO CONTEST" will, otherwise the mother will continue to work on the children unless the wife and mother in law are in jail for 25 years). As long as the wife and mother in law discover (ONLY AFTER everything is FINISHED/"iron clad", but once you stop being their target, the children will become their target) that this has been done, they will have no more incentive for the rest of your life to run you down. Make copies of the orders of protection and get a lawyer (and a safe box in case of the lawyer's collaboration, your wife may have certain legal rights to interfere with the lawyer.client relationship, don't know) at a bank to keep the full details of this whole situation. EMBED the details of all of this in your will so that your children are protected even if your wife and mother in law run you down for spite (at this point, we're no longer in the world of logic). Include declarations of this and ensure accountability at the investment companies where your wealth is located.
There is always the chance that instead of running you down, they will change their efforts and simply have you declared mentally incompetent (conservatorship, difficult if you have a good job and character references that are documented, do you have any notariety?...become socially VISIBLE) and they will ask the court to grant them your powers of attorney. Talk to a lawyer to arrange protections for yourself AND your children (right now, you have power over the wife and mother in law ONLY as long as you are alive).
Save ALL documents (including your post, DATES and URL make it officially verifiable) that show awareness of the situation are very important in court poison control reports, hospital reports and forgeries, etc.).
Restrict access to your your computer, financial records and accounts (right now, your wife has full access legally AND in your house), check your credit often (some states allow a full lockdown, but you yourself can't open a credit account while it's in place, there are 3 credit bureaus that don't all share accurate and valid info about you), use secret cameras and tape recorders around the house (they're not just trying to kill you, they are EVIL PEOPLE) and consider finding a way to put them both in jail (for the sake of your children). Take ID theft seriously.
Find out where your name is being used (they want money for EXTENSIVE searches, but there's alot you can get for nothing also....public info law).
http://pipl.com/
http://www.infospace.com/
http://www.zabasearch.com/search_engines.php?
Go to IDTHEFT.org for more info about monitoring your credit at all three credit bureaus. Check the Post Office for PO boxes at your address, false names, etc.
Don't take this situation for granted.
On this forum, we have all gone through alot, but this is situation is the most insane that I've ever heard.
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You have been through alot, but I don't understand how or why you assumed responsibility for what THEY did.
WHY you did this is one thing, do you believe that you deserve a penalty for something else that you've done INTENTIONALLY (otherwise MISTAKES are no sin against God) in your life (if so, then you are completely remorseful and repentant), in other words, you have already been given forgiveness by God because you have repented), but also, Jesus is the judge, NOT YOU.
AND, if it is your desire to take away THEIR responsibility for what THEY have done, you are not only robbing them of their humanity, you are limiting "proverbial justice" (denying justice it's due). Do not take away THEIR responsibility for what has been done (the "sin eater" was an old LEGEND/make believe story, it is not true).