I am the nominee in accidental claim of brother can his wife claim it?

According to law, a nominee is a trustee not the owner of the assets. In other words, he is only a caretaker of your assets. The nominee will only hold your money/asset as a trustee and will be legally bound to transfer it to the legal heirs. For most investments, a legal heir is entitled to the deceased’s assets. For instance, Section 39 of the Insurance Act says the appointed nominee will be paid, though he may not be the legal heir. The nominee, in turn, is supposed to hold the proceeds in trust and the legal heir can claim the money. Thus the wife and child shall be entitles to the proceeds generating out of the policy.