The fiduciary may make distribution to any person to whom this discretion is applicable or apply or distribute the same for his benefit or account, or retain all or any part of the same, whether principal or income, in trust for him and thereafter at any time or times distribute part or all to him or apply or distribute the same for his benefit or account. When the discretion hereunder terminates, whether by reason of the age, or otherwise, the fiduciary shall distribute any property retained in trust for such person hereunder to such person, or to his guardian or conservator or to his estate, as the case may be. Such discretion shall not apply to any distribution to which the spouse, surviving spouse or surviving child of the testator or settlor making the instrument is entitled either outright or under a trust or share which qualifies for a marital or orphan deduction under applicable federal tax laws, except that distributions may be made to or applied for the benefit of such spouse, surviving spouse or surviving child, as the case may be.