Legal Question in Wills and Trusts in New York

Your question cannot be answered without a review of your grnadmother's will.

I agree with Rudolf, unless the account registration is different. For example, if the Will just leaves it to him, without specifying he is to hold it for you, like a trustee, or the account had his name on it, without naming you also, he may have a legal claim even if your grandmother intended something different. This may require litigation and you might have an uphill battle if the purpose cannot clearly be established. This is a response to an Internet question and the reply is not intended to be legal advice or as creating an attorney-client relationship.