Legal Question in Family Law in Massachusetts

Unlikely he gets any of that.

If you are not divorced yet, the court and his attorney are likely to view it as a marital asset. If you do not claim it until after the divorce and he finds out, he can go back to court and claim half of it plus attorneys fees and other costs.

Your best solution is to discuss a strategy with your attorney in dealing with this issue.

Yes, he is. It does not matter that you have not claimed the money yet. He and his Attorney would rightfully argue that the money is marital property as you won it during the marriage and thus it is subject to equitable distribution.