Although you are supposed to manage your father's finances as part of your duties as Power of Attorney, that does not usually include gifting assets. Even if the will states that you and your siblings are to be the beneficiaries of the estate, you are not yet acting as Executor. Also, debts to the estate need to be settled (among other things) before the estate is distributed to beneficiaries. (See our Executor Guide for full details.) It is safer to avoid gifting a living parent's assets to avoid potential estate litigation issues in the future.