It all depends on whether the couple is still together. If they are, there is no point in arguing—they can manage the money together. However, if they are separating, it would be fair, as a sign of gratitude, for the man to give the woman a portion of the winnings since he took her money without her consent. If they were husband and wife, then without a doubt, the winnings should be split equally, as family income is considered joint property and should be fairly shared between spouses.