He may not but he could get it. It may be in her important papers, he may also need to sign off on a request? I would simply ask first that's all I am saying.

You handle it however, you see fit.

Could you find a friend or "third party" to approach the surviving relative. Tell her there is an unclaimed account in the amount of $527.84, all you need is a certified Death Certificate and you will release the funds in the form of a cashier's check.

No muss, no fuss, no lawyers.