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Why are you being asked to do this? Is there a divorce?
Unfortunately you cannot control what he does with it or otherwise make sure that you are provided for in case he dies. You can only exercise whatever options are available to you regarding the retirement benefits and you should see a tax advisor on that.
Regarding death benefits, if he has a will and does not leave you a certain amount, the courts look to all the assets left to you to see if you have a "right of election" to take more than the will gives you. For instance, the will could leave you very little, but you might inherit a joint house worth 2 million and be the beneficiary of a 5 million dollar life insurance policy and the court will say you have been adequately provide for by virtue of those 2 assets that pass by operation of law to you outside the will.
Yes. Make him put your name on them as owner in addition to his. That's between you and him.